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Stubble burning

Stubble burning is the agricultural practice of intentionally igniting crop residues, such as straw and stubble left in fields after harvest, to rapidly clear land for the next planting cycle, control weeds and pests, and return nutrients to the soil via ash deposition.^[1]^[2] This method is favored by farmers facing tight timelines between harvests, particularly in intensive double-cropping systems like rice followed by wheat, where mechanical or biological residue management alternatives demand higher upfront costs and labor.^[3]^[4] The practice is most extensive in the Indo-Gangetic Plains of northern India, where Punjab and Haryana account for a substantial portion of global agricultural fire activity during the post-monsoon rice harvest season from October to November.^[5] In these regions, millions of tons of paddy residue are burned annually, driven by economic pressures including low mechanization levels, limited access to affordable residue incorporation machinery, and the need to avoid yield penalties from delayed wheat sowing.^[6] Despite incentives for alternatives like the Happy Seeder, adoption remains low among smallholder farmers due to perceived risks and insufficient subsidies.^[7] Stubble burning releases large quantities of particulate matter (PM2.5), black carbon, and greenhouse gases including CO2, CO, and CH4, contributing to seasonal spikes in regional air pollution.^[5] In Delhi, stubble fires have been linked to 14-31% of PM2.5 concentrations during peak periods, exacerbating smog episodes that impair visibility and public health, with estimates attributing 44,000 to 98,000 premature deaths annually across India to exposure from residue burning between 2003 and 2019.^[8]^[9]^[5] Additional environmental effects include soil nutrient volatilization, reduced microbial diversity, and increased erosion vulnerability from loss of surface cover.^[10]^[11] Regulations prohibiting open burning have been enacted in India since 2015, with penalties and promotion of in-situ management techniques, yet enforcement challenges persist amid farmer resistance rooted in short-term productivity gains over long-term sustainability.^[6] Controversies center on balancing pollution mitigation with agricultural viability, as viable alternatives like bioenergy conversion or composting require scalable infrastructure and policy support to offset the immediate economic advantages of burning.^[12] Recent data indicate declining fire incidents due to stricter monitoring and subsidies, though wind patterns and jurisdictional incentives continue to influence compliance.^[13]^[14]

Definition and Practices

Overview of Stubble Burning

Stubble burning is the deliberate combustion of crop residues, such as straw stubble remaining after the harvest of grains like rice and wheat, to clear fields for the next planting cycle. This agricultural method is utilized primarily in intensive cropping systems where narrow temporal windows between harvests demand rapid residue disposal to avoid delays in sowing subsequent crops. Farmers ignite the dry stubble in situ, allowing flames to consume the biomass quickly, which incorporates some ash back into the soil while eliminating weeds, pests, and unharvested material.^[15] The practice is most extensive in the Indo-Gangetic Plains of northern India, encompassing states like Punjab, Haryana, and Uttar Pradesh, where rice-wheat rotations prevail and generate substantial residue volumes—approximately 20-22 million tons annually from paddy alone in Punjab and Haryana combined. In Punjab, stubble burning incidents peaked at over 36,000 in 2023 but declined to 10,909 in 2024, attributed to enforcement measures and promotion of alternatives, though the activity remains concentrated during the post-monsoon rice harvest in October-November. Haryana similarly reported fewer fires, with 559 incidents between September 15 and October 15 in 2024, the lowest in recent years for that period.^[5]^[16]^[17] Globally, crop residue burning occurs across diverse agricultural regions, including Southeast Asia, Australia, and parts of North America, often following cereal harvests to manage excess biomass. In tropical areas, it accounts for a significant portion of biomass burning emissions, with practices varying by crop type and mechanization levels; for instance, while less common in mechanized Western farming due to baling and removal, it persists in labor-constrained or cost-sensitive operations worldwide. Despite regulatory bans in many jurisdictions, adoption endures due to its low-cost efficacy in residue clearance.^[18]^[18]

Crop Residue Management Techniques

Crop residue management techniques primarily involve in-situ methods that retain residues on or incorporate them into the soil, as well as ex-situ approaches that facilitate removal for alternative uses, all aimed at preserving soil health, reducing erosion, and recycling nutrients without combustion.^[19] These practices contrast with open burning by leveraging mechanical, biological, and agronomic strategies to handle residues from crops like rice and wheat, which generate substantial biomass—approximately 20 million metric tonnes of paddy residue annually in Punjab, India alone.^[20] In-situ incorporation entails tilling residues directly into the soil using implements such as rotavators or disc harrows, which decomposes organic matter over time and enhances soil organic carbon levels, though it risks temporary nutrient immobilization and planting delays due to high residue volumes.^[21] This method improves long-term soil fertility by returning carbon and nutrients, with studies showing reduced erosion compared to bare fallow systems.^[19] However, in intensive rice-wheat rotations, full incorporation can increase fuel use and equipment wear, prompting hybrid approaches.^[22] Conservation tillage techniques, including zero-tillage and mulch-till systems, leave residues on the surface as mulch, suppressing weeds, conserving moisture, and minimizing soil disturbance to foster microbial activity and earthworm populations.^[23] In Punjab's rice-wheat systems, the Happy Seeder—a specialized zero-till drill—simultaneously cuts and deposits rice stubble while sowing wheat, enabling residue retention without prior clearing; field trials indicate this approach yields profitability gains of about 10% over conventional practices while cutting emissions.^[24] Adoption has accelerated, with Punjab targeting full residue management of its paddy output by 2024 through subsidized machinery, reducing burning incidence.^[20] Ex-situ techniques focus on mechanical collection and relocation, such as baling residues into compact bundles for use as livestock fodder, biofuel pellets, or industrial raw materials, which diverts biomass from fields and generates supplementary income—baled straw can fetch market prices supporting farmer viability.^[25] Super straw management systems, combining balers with shredders, efficiently gather loose residues post-harvest.^[26] Composting transforms residues into nutrient-rich manure via aerobic decomposition, often accelerated with microbial inoculants, recycling up to 80% of nitrogen and phosphorus while mitigating methane emissions from anaerobic decay.^[12] Emerging options like biochar production pyrolyze residues in oxygen-limited conditions to yield stable carbon amendments that enhance soil water retention and cation exchange capacity, offering a carbon sequestration pathway; pilot applications in wheat-paddy systems demonstrate viability as a residue valorization strategy.^[27] Overall, integrating these techniques—tailored to residue type, soil conditions, and cropping intensity—supports sustainable yields, with meta-analyses confirming residue retention boosts productivity by 5-15% in no-till setups over burned fields.^[28] Challenges include upfront machinery costs, addressed through subsidies in regions like India, and the need for farmer training to optimize implementation.^[29]

Historical Development

Global Origins and Traditional Uses

Stubble burning, the intentional ignition of crop residues remaining after grain harvest, traces its origins to ancient agricultural practices in settled cereal farming regions. Historical accounts from ancient Greece document the burning of stubble, herbage, and dry leaves as part of field management, as reported in agricultural mythology compiled in the mid-20th century from classical sources.^[30] This method predates mechanized harvesting and reflects early uses of fire for residue disposal in Mediterranean agroecosystems, where fire control enabled selective burning without full field clearance akin to slash-and-burn shifting cultivation.^[30] Traditionally, stubble burning facilitated rapid field preparation for subsequent crops by decomposing tough residues that hindered replanting, a practice valued in pre-industrial eras for its simplicity and low labor input compared to manual incorporation.^[31] It also served to suppress weeds, pests, and pathogens through thermal destruction, with ash providing a quick return of minerals like potassium to the soil, enhancing short-term fertility in nutrient-depleted fields.^[32] In Europe, such as in England prior to World War II, burning was limited due to the multifunctional value of straw for livestock feed and bedding, but it occurred where residues were abundant and alternative uses uneconomical.^[31] Globally, analogous practices appeared in Asia's rice and wheat systems for expedited residue clearance, though pre-Green Revolution manual harvesting often favored tillage over fire to preserve organic matter.^[33] In Africa and the Americas, stubble burning integrated with broader fire-based land management in tropical and subtropical grain production, aiding pest control and soil warming for early sowing, distinct from slash-and-burn's forest-clearing focus on virgin soils.^[34] These uses persisted where mechanization was absent, prioritizing operational efficiency over long-term soil health concerns evident only later through empirical observation.^[35]

Modern Intensification in Intensive Cropping Systems

The modern intensification of stubble burning coincided with the Green Revolution's expansion of intensive rice-wheat cropping systems in India's Punjab and Haryana regions starting in the 1960s. High-yielding, short-duration varieties of paddy and wheat enabled double-cropping rotations, with rice harvested in late October and wheat sown by mid-November to maximize yields under irrigated conditions.^[36] This compressed timeline, combined with increased residue production from higher biomass yields—up to 2-3 tons of straw per hectare for paddy—necessitated rapid field clearance, making burning a practical option over labor-intensive manual removal or incorporation.^[37] Mechanization further amplified this trend from the late 1980s, as combine harvesters became prevalent, leaving behind 10-15 cm tall stubble that was difficult to till into soil manually or with traditional tools.^[38] Unlike earlier manual harvesting methods, which often cut residues closer to the ground for use as fodder or thatch, mechanized operations produced uniform, anchored stubble unsuitable for livestock and prone to incomplete decomposition in heavy clay soils typical of the region.^[36] By the 1990s, stubble burning events in Punjab surged, with satellite data indicating a marked rise correlated to these shifts, as farmers prioritized operational efficiency amid labor shortages and rising costs.^[39] This pattern extended beyond India to other intensive systems, such as in China's wheat-rice belts, where similar post-Green Revolution intensification led to residue overload, though enforcement of bans has varied.^[6] In Punjab, annual paddy straw generation reached approximately 20 million tons by the 2010s, with burning accounting for over 70% of disposal in peak years before regulatory interventions, underscoring the causal link between cropping intensification and fire reliance.^[40] Empirical assessments attribute the persistence to the economic calculus of time-sensitive planting, where delays in wheat sowing could reduce yields by 1-2% per day.^[41]

Motivations for Adoption

Agronomic and Operational Advantages

Stubble burning provides operational advantages by enabling rapid field clearance in time-sensitive cropping cycles, such as the rice-wheat rotation prevalent in India's Indo-Gangetic Plains, where the interval between rice harvest in late October and optimal wheat sowing is typically 10-15 days. Delayed planting beyond this window can reduce wheat yields by up to 1% per day, making quick residue disposal essential to maintain productivity.^[42]^[37] This method requires minimal labor and equipment beyond ignition, contrasting with mechanical incorporation or baling, which demand additional machinery, fuel, and time often unavailable to smallholder farmers managing large areas.^[1]^[43] Agronomically, the practice destroys weed seeds, insect pests, and disease pathogens harbored in crop residues, reducing the incidence of issues like rice root rot or wheat take-all fungus in subsequent seasons and thereby lowering the need for herbicides or pesticides.^[44]^[1] By eliminating bulky stubble, burning enhances soil aeration and eases tillage, which promotes better seed-to-soil contact and root establishment for the next crop while minimizing equipment blockages and associated operational costs.^[45]^[46] These benefits are particularly pronounced in mechanized harvests that leave tall, dense stubble stands, which otherwise impede planting.^[32]

Economic Pressures on Farmers

The narrow temporal window between rice harvest and wheat sowing in India's Indo-Gangetic Plains, typically 7–10 days for non-basmati varieties and 15–20 days for basmati, compels farmers to prioritize rapid field clearance to avoid yield penalties in the subsequent wheat crop.^[47] Delays of even one week beyond optimal sowing can reduce wheat yields by approximately 150 kg per acre, amplifying economic risks for farmers reliant on double-cropping systems for income stability.^[48] Stubble burning enables quick residue removal at minimal upfront cost, often under ₹500 per acre including labor and fuel, contrasting with alternatives that demand significant capital investment.^[49] Smallholder farmers, who dominate Punjab and Haryana's agriculture with average landholdings below 2 hectares, face prohibitive barriers to adopting machinery like Happy Seeders or balers, which require initial costs exceeding ₹5–10 lakh per unit and ongoing maintenance.^[50] ^[51] While studies indicate that such in-situ management tools can yield 10–20% higher net profits over burning in the long term through reduced tillage and improved soil health, the high purchase price, limited access to custom hiring services, and fuel expenses deter uptake among resource-constrained producers.^[51] Cost remains the primary driver for preferring burning, with surveys showing over 60% of farmers aware of alternatives but opting out due to financial pressures, even amid government subsidies covering 50–80% of machine costs.^[52] Mechanized rice harvesting, promoted since the 2000s for efficiency gains, has paradoxically intensified burning by producing loose, voluminous stubble that is labor-intensive and costly to manage manually, with labor wages in Punjab rising to ₹300–500 per day.^[53] ^[54] Regulatory fines, ranging from ₹2,500 to ₹15,000 per incident as imposed by the National Green Tribunal since 2015, add uncertainty but often fail to exceed the net savings from burning when alternatives' total costs—including potential yield risks from unproven methods—are factored in.^[55] This dynamic underscores systemic economic vulnerabilities, where policy enforcement overlooks small farmers' cash flow constraints and the absence of scalable, low-cost residue markets or bioenergy incentives.^[56]

Environmental and Health Effects

Atmospheric Pollution from Emissions

Stubble burning releases a mixture of primary and secondary atmospheric pollutants via incomplete combustion of dry crop residues, primarily fine particulate matter (PM2.5), black carbon (BC), organic carbon (OC), carbon monoxide (CO), nitrogen oxides (NOx), volatile organic compounds (VOCs), and sulfur oxides (SOx).^[12]^[5] These emissions occur predominantly during post-harvest periods, such as October-November for rice residues in India's Indo-Gangetic Plain, where smoldering fires produce persistent smoke plumes that elevate regional aerosol loading.^[5] BC and OC within PM2.5 dominate the aerosol fraction, absorbing sunlight and promoting radiative forcing, while VOCs and NOx serve as precursors for ground-level ozone and secondary organic aerosols.^[5]^[6] In India, annual emissions from burning approximately 92-100 million metric tonnes of crop residue have been quantified using emission inventories and satellite data. For the 2008-2009 burning season involving 98.4 million tonnes, outputs included 141.15 million tonnes of CO2 (91.6% of total mass), 8.57 million tonnes of CO (66% of non-CO2 emissions), 1.46 million tonnes of non-methane VOCs (11% of non-CO2), 0.23 million tonnes of NOx (2.2% of non-CO2), 1.21 million tonnes of PM (including PM2.5 and PM10), 0.037 million tonnes of SOx, and 0.12 million tonnes of ammonia (NH3).^[12] Similar scaled estimates for 63 million tonnes burned yield 91 million tonnes of CO2, 1.2 million tonnes of PM, 3.4 million tonnes of CO, 0.1 million tonnes of NOx, and 0.6 million tonnes of methane (CH4).^[6] These figures derive from field-based emission factors adjusted for residue type (e.g., rice vs. wheat) and combustion efficiency, with rice residue burning yielding higher PM and BC due to higher silica content and lower moisture.^[12] Emissions inventories from 2003-2019, informed by the Global Fire Emissions Database, highlight PM2.5 as a key pollutant, with primary BC and OC fractions driving immediate visibility reduction and long-range transport via prevailing winds.^[5] Quantified PM2.5 emissions contribute to seasonal haze episodes, where aerosol optical depth increases markedly over northern India during peak events, as observed via MODIS satellite retrievals.^[5] Incomplete combustion efficiency—typically 80-90% for open-field burns—amplifies non-CO2 pollutants relative to controlled incineration.^[6]

Relative Contribution Compared to Other Sources

Stubble burning episodes in Punjab and Haryana predominantly occur during October and November, coinciding with the rice harvest, and contribute episodically to elevated particulate matter (PM2.5) levels in the Indo-Gangetic Plain, including Delhi. Empirical modeling and satellite data indicate that during peak burning periods, agricultural fires can account for 20-40% of PM2.5 concentrations in Delhi, with contributions varying by wind direction, fire intensity, and atmospheric stability; for instance, one analysis estimated a mean of 31 ± 16% to PM2.5 from crop residue burning under typical conditions.^[57]^[58] This seasonal spike is amplified by inversion layers and stagnant air, which trap emissions and transport smoke southward over distances of 200-500 km.^[59] In contrast, year-round source apportionment reveals that stubble burning's overall contribution diminishes outside this window, comprising less than 10% of annual PM2.5 in Delhi when averaged across all sources. Vehicular emissions, responsible for 20-30% of PM2.5 through direct particulates and precursors like nitrogen oxides and volatile organic compounds, emerge as a persistent dominant factor, exacerbated by Delhi's vehicle fleet exceeding 10 million as of 2023. Industrial emissions and power plants contribute another 15-25%, primarily via sulfur dioxide and heavy metals, while secondary aerosols from ammonia and ozone reactions—often linked to agriculture but not burning—add 20-30%. Construction dust and road re-suspension account for 15-20%, underscoring the multifaceted urban and regional drivers that sustain baseline pollution levels exceeding WHO guidelines by factors of 10-15 annually.^[60]^[5] For organic aerosols specifically, biomass burning including stubble constitutes about 35% annually in Delhi, but this encompasses broader sources like household wood combustion, which rivals or exceeds agricultural fires in non-peak months. Carbon monoxide source attribution during the burning season shows crop residues at 27-44%, comparable to anthropogenic emissions (32-49%), yet the former's impact is transient and geographically concentrated. These relative shares highlight that while stubble burning drives acute winter exacerbations, systemic reductions in transport and industrial emissions are essential for addressing chronic pollution, as evidenced by limited AQI improvements despite declining fire incidents from 100,000+ in 2018 to under 50,000 by 2023.^[61]^[62]^[63]

Soil Fertility and Long-Term Agronomic Impacts

Stubble burning results in significant nutrient volatilization, particularly of nitrogen, which can evaporate as ammonia or nitrogen oxides, leading to losses estimated at 20-50% of available nitrogen in residues depending on burn conditions. Phosphorus and potassium are partially retained in ash but experience reduced bioavailability due to altered soil chemistry, with studies indicating net losses of up to 10-15% for phosphorus when burning is frequent. ^[6] ^[64] Long-term repeated burning depletes soil organic carbon (SOC) by converting it to atmospheric CO2, with field trials showing reductions of 0.14% SOC after 16 years under burning regimes compared to no-burn practices, exacerbating soil structure decline and lowering water-holding capacity by impairing aggregate stability. This organic matter loss diminishes cation exchange capacity, hindering nutrient retention and contributing to acidification in alkaline soils common in rice-wheat systems. ^[65] ^[66] Burning elevates soil temperatures to approximately 42°C, sterilizing surface layers and reducing beneficial microbial biomass by 30-70%, disrupting nitrogen-fixing bacteria and decomposers essential for organic matter breakdown and nutrient cycling. Over decades, this microbial depletion correlates with decreased enzymatic activity, such as dehydrogenase levels, fostering pathogen buildup and reduced soil resilience to stresses like drought. ^[67] ^[68] Agronomically, sustained stubble burning accelerates soil degradation, necessitating higher fertilizer inputs—up to 20-30 kg/ha more nitrogen annually—to maintain yields, as evidenced in Indo-Gangetic Plains studies where burned fields showed 5-10% yield declines after 10-15 years relative to residue-retained systems. While short-term benefits include rapid residue clearance for tillage, long-term effects include increased erosion vulnerability from lost mulch cover and elevated pest pressures due to disrupted biodiversity, underscoring a net negative impact on sustainable productivity. ^[42] ^[69]

Alternatives to Burning

In-Field Residue Incorporation Methods

In-field residue incorporation involves integrating crop stubble directly into the soil profile to decompose naturally, thereby retaining organic matter, nutrients, and soil structure while avoiding open burning. This approach contrasts with ex-situ removal by leveraging tillage or specialized machinery to mix residues below the surface or as surface mulch, enhancing long-term soil fertility through microbial breakdown. Empirical studies indicate that incorporation can increase soil organic carbon by 0.2-0.5% over multiple seasons in rice-wheat systems, though initial decomposition may temporarily immobilize nitrogen, requiring supplemental fertilizers.^[70]^[24] Conventional tillage methods, such as rotavation or disc plowing, mechanically chop and bury stubble to a depth of 10-15 cm, facilitating rapid decomposition via soil microbes. Rotavators, commonly used in India's Punjab region, prepare fields for the next crop by incorporating up to 90% of rice straw residues within 7-10 days post-harvest. This technique has been standard in intensive cropping but can compact soil and accelerate erosion if overused, with long-term trials showing reduced aggregate stability compared to reduced-till systems.^[71]^[72]^[73] Zero-tillage incorporation technologies, exemplified by the Happy Seeder, enable direct sowing of wheat into standing rice stubble by simultaneously cutting, mulching, and partially incorporating residues as a 15-20 cm surface cover while depositing seeds below. Introduced in Punjab around 2007, this method has expanded to over 1 million hectares by 2021, subsidized under Indian government schemes, yielding wheat harvests comparable to conventional methods (4.5-5 tons/ha) while conserving 30-50% of irrigation water and reducing fuel use by 20-30%. Field experiments confirm it preserves soil carbon stocks better than full tillage, with residue mulch suppressing weeds and enhancing microbial diversity, though farmers report occasional pest pressures from retained humidity.^[74]^[20]^[75]^[76] Super seeders and similar hybrids combine partial incorporation with fertilizer banding, addressing nitrogen tie-up by applying urea directly with seeds, achieving residue retention rates of 80-90% without yield penalties in trials across northern India. Adoption barriers include high initial equipment costs (₹5-7 lakh per unit) and the 10-15 day window constraint in double-cropping, yet data from 2023-2024 show a 20-30% rise in usage following rental subsidies, correlating with 15% drops in regional stubble burning incidents. Long-term soil health benefits, including 23% higher mineralizable carbon under reduced tillage, outweigh conventional methods' short-term speed advantages, per 30-year comparative studies.^[77]^[49]^[72]

Ex-Situ Utilization and Processing Options

Ex-situ utilization entails the collection, baling, and transportation of crop stubble—primarily rice and wheat residues—to off-field processing facilities for conversion into value-added products, circumventing the need for in-field burning.^[78] This approach leverages thermochemical and biochemical technologies to produce bioenergy, biofuels, and materials, with India's surplus crop residues (356.7 million tonnes annually) holding potential for 53,767 MWe of electricity generation.^[79] In Punjab, where paddy stubble burning is prevalent, operational ex-situ projects consumed about 0.88 million tonnes of residue in biomass power plants as of September 2020.^[78] Thermochemical processing dominates ex-situ options, involving high-temperature conversion without oxygen. Direct combustion in dedicated biomass power plants generates electricity; for example, Punjab's 11 operational plants (totaling 97.5 MW capacity) utilize rice stubble alongside other feedstocks, while the Jalkheri facility processes 120,000 tonnes annually to produce 10-15 MW, supporting 15,000 farmers.^[78]^[64] Gasification converts stubble into syngas for power or heat, as in small-scale 250 kWe plants that process up to 2,000 tonnes of rice straw yearly to also enable refrigeration via combined heat and power.^[80] Pyrolysis yields biochar, bio-oil, and syngas; rice-wheat stubble from Haryana-Punjab regions can be pyrolyzed to produce biochar for soil amendment, enhancing nutrient availability and carbon sequestration while mitigating emissions equivalent to 1,068 kg CO₂e per tonne processed.^[81]^[79] Densification into pellets or briquettes facilitates co-firing in coal plants; 10% biomass co-firing requires 1.47 million tonnes annually in India, with delivered pellet costs at INR 4,720 per tonne for distances up to 50 km.^[78] Biochemical methods employ microbial processes for biofuel production. Anaerobic digestion of stubble with manure yields biogas, with co-digestion producing up to 12,355 mL biogas and 6,610 mL methane per batch, suitable for electricity or upgraded bio-CNG.^[64] In Punjab, eight bio-CNG projects under execution will use 0.3 million tonnes of residue annually.^[78] Fermentation enables cellulosic ethanol via enzymatic hydrolysis of stubble cellulose; a 100 KL/day plant in Bhatinda, Punjab (under construction as of 2020), requires 0.2 million tonnes yearly.^[78]^[64] These processes collectively reduce emissions by up to 1,068 kg CO₂e per tonne compared to burning.^[79] Additional processing yields non-energy products, including compressed residues for packaging, paper, or building materials, though scalability lags behind energy applications.^[64] Planned ex-situ projects in Punjab could aggregate 1.5 million tonnes yearly (7% of paddy residue), requiring 850-1,300 straw aggregation banks for efficient supply chains.^[78] Economic viability hinges on transport costs (INR 1,330 per tonne for 15 km aggregation) and incentives, with thermochemical routes offering higher returns through grid-connected power sales.^[78]^[79]

Policy and Regulatory Frameworks

Indian Regulations and Enforcement Efforts

In India, stubble burning has been prohibited under the Air (Prevention and Control of Pollution) Act, 1981, with enforcement reinforced through directives from the National Green Tribunal (NGT) and the Supreme Court since the mid-2010s.^[82] The National Policy for Management of Crop Residue, formulated by the central government in 2014 and updated subsequently, mandates in-situ management of crop residues and prohibits open burning, requiring states to implement action plans with timelines for compliance.^[12] States such as Punjab, Haryana, and Uttar Pradesh enacted specific laws in 2015 to curb the practice, including penalties for violations, though initial implementation focused on awareness rather than strict deterrence.^[83] The Commission for Air Quality Management (CAQM) in the National Capital Region and Adjoining Areas, established via the CAQM Act, 2021, serves as the primary regulatory body for coordinating enforcement in pollution hotspots like Delhi-NCR.^[84] CAQM guidelines require district authorities to appoint nodal officers for each village and cluster officers for groups of 20 villages to monitor and prevent burning, supported by satellite-based surveillance from the Indian Space Research Organisation (ISRO) to detect hotspots in real-time.^[85] Penalties under CAQM were doubled in November 2024 to environmental compensation charges graded by farm size: ₹5,000 for holdings under 2 acres, ₹10,000 for 2-5 acres, and ₹30,000 for over 5 acres per incident, with provisions for assessing and recovering fines on-the-spot.^[86]^[87] Additionally, CAQM empowered district magistrates in October 2025 to impose disciplinary action against government officials failing to enforce bans, aiming to address lapses in ground-level implementation.^[88] Supreme Court interventions have intensified regulatory pressure, with orders in 2019 explicitly banning stubble burning and directing states to prosecute offenders.^[82] In October 2024, the Court summoned chief secretaries of Punjab and Haryana for inadequate action, criticizing low fine recoveries—such as ₹11 lakh from 417 violations—as insufficient deterrence.^[89]^[82] By September 2025, the Court advocated criminal prosecution under Indian Penal Code provisions, including potential imprisonment, rejecting leniency for farmers and urging the central government to amend laws for stricter accountability, though the government preferred policy incentives over widespread jail terms.^[90]^[91] In November 2024, the Court highlighted enforcement as "eyewash" in Punjab, mandating immediate directives to prohibit permissions for burning and emphasizing traceability of violations.^[92] Despite these measures, enforcement remains challenged by resource constraints and farmer non-compliance, with studies indicating an initial 30% reduction in fires post-ban but persistent hotspots during harvest seasons.^[93] CAQM data from 2022 shows a decline in thermal hotspots following enhanced monitoring, yet judicial critiques underscore gaps in prosecuting officials and achieving uniform state-level adherence.^[84] Efforts include integrating subsidies for machinery under the Sub-Mission on Agricultural Mechanization, but regulatory focus prioritizes punitive actions over solely economic relief to deter recurrence.^[4]

International Practices and Lessons

In the United Kingdom, stubble burning was prohibited nationwide effective from September 1993 under the Crops (Burning of Straw and Stubble) (Prohibition) Regulations, following a 1989 parliamentary decision driven by evidence of air pollution and health risks documented in the 1984 Royal Commission on Environmental Pollution report.^[94] Enforcement involves fines up to £5,000 for violations under the Environmental Protection Act 1990, with permitted exceptions limited to specific circumstances like disease control under strict protocols.^[95] Farmers adapted by adopting mechanical methods such as deep ploughing for residue incorporation, baling for livestock fodder, or mulching, which improved long-term soil structure despite initial equipment costs subsidized through agricultural grants.^[95] Across the European Union, analogous national bans on open burning of crop residues, aligned with EU air quality directives, have curtailed the practice to negligible levels, favoring conservation tillage and residue retention to bolster soil carbon sequestration and erosion control.^[96] In the United States, crop residue burning accounts for less than 5% of management practices in major croplands, with the U.S. Department of Agriculture's conservation programs promoting no-till and strip-till systems that leave over 30% residue cover on fields, reducing erosion by up to 90% compared to conventional tillage.^[19] Australian dryland farming emphasizes stubble retention for moisture conservation, supplemented by grazing or biomass harvesting, rendering burning non-preferred except in isolated cases.^[97] Key lessons from these implementations include the efficacy of combining prohibitive regulations with economic incentives, such as machinery subsidies and markets for residue-derived biofuels, as evidenced in China's approach of fining burners while funding balers and biogas plants, which reduced burning incidents by over 90% in key provinces since 2015.^[97] The UK's transition highlights that while bans achieve rapid pollution declines, sustained compliance requires addressing farmer concerns over pest control and yield impacts through research-backed alternatives and extension services, avoiding over-reliance on penalties that may foster resentment without viable options.^[98] In North America, integrating residue management into broader soil health incentives has proven cost-effective, suggesting that for regions like northern India, prioritizing scalable ex-situ utilization—such as pelletizing for energy—alongside in-field technologies could mitigate economic barriers more effectively than enforcement alone.^[99]

Controversies and Stakeholder Perspectives

Debates on Pollution Causality and Exaggeration

Debates on the causality of stubble burning in Delhi's air pollution crisis question whether it is the primary driver or if its role is exaggerated relative to other emission sources. Proponents of strong causality emphasize its seasonal spike, with modeling indicating that stubble fires in Punjab and Haryana contribute up to 35% of PM2.5 concentrations in Delhi during peak periods from mid-October to mid-November, transported by northwesterly winds.^[100] This contribution aligns with satellite observations of fire hotspots correlating with elevated aerosol optical depths over the Indo-Gangetic Plain.^[59] Critics contend that the focus overstates stubble burning's overall impact, noting its average seasonal share at around 10.6% for PM2.5 in Delhi during late 2024, while year-round sources dominate.^[100] Vehicular emissions account for approximately 20% of PM2.5 annually, road dust for 38%, domestic fuel burning for 12%, and industrial sources for 11%, persisting beyond the brief burning window.^[101] These local factors, combined with meteorological trapping via winter inversions, amplify pollution regardless of stubble inputs, as evidenced by sustained high AQI levels even amid declining fire incidents.^[102] Analyses argue that media and policy narratives exaggerate stubble burning to scapegoat farmers, diverting attention from unmanaged urban emissions like construction dust and waste burning, which governmental reports identify as equally culpable during non-burning months.^[103] Court proceedings have highlighted discrepancies, with official estimates placing stubble's share at only 10% in some assessments, prompting calls for balanced enforcement over singular blame.^[104] Empirical source apportionment studies confirm biomass burning, including stubble, as significant but not sole during the post-monsoon season, underscoring the need for multi-source interventions rather than isolated targeting.^[105]

Farmer Resistance and Economic Trade-Offs

Farmers in Punjab and Haryana predominantly continue stubble burning due to its negligible direct costs—primarily limited to minimal labor for ignition and oversight—and its rapidity in clearing fields, often within hours, amid a constrained 10-15 day window between rice harvest and wheat sowing to maximize economic returns from the intensive rice-wheat rotation.^[106]^[55] This practice is perceived by a majority as economically feasible, requiring fewer efforts than mechanical alternatives and aiding in weed, pest, and pathogen control, with surveys showing high agreement (weighted mean scores of 83.67% for weed reduction and 77.89% for pest control).^[107] In contrast, options like manual residue removal can cost Rs. 6,000-7,000 per acre in labor alone, rendering burning the default for resource-limited smallholders who constitute much of the farming base.^[108] Alternatives such as the Happy Seeder, which sows wheat directly into unburnt residue, present operational costs of approximately Rs. 1,500-2,100 per hectare (or Rs. 600-850 per acre), lower than conventional tillage plus burning at Rs. 3,000-3,100 per hectare, potentially yielding net savings and equivalent or slightly higher wheat productivity over time.^[109]^[110]^[111] However, upfront barriers include machine purchase prices of Rs. 1.5-1.8 lakh (with 50% subsidies available but mistrusted or inaccessible), requirements for high-power tractors unaffordable to many, and added fuel or service fees when hiring equipment, leading to resistance among farmers who view these as higher-risk investments without guaranteed yield offsets.^[112]^[113]^[107] Economic analyses indicate that while long-term adoption could boost profits by 10-20% through reduced tillage and fertilizer needs, short-term liquidity constraints and uncertain subsidy delivery exacerbate skepticism.^[114] Resistance is further compounded by policy enforcement challenges, including fines of Rs. 2,500-15,000 per incident that disproportionately burden small farmers without addressing root economic disincentives, and perceptions of inequitable application favoring larger operators.^[12] Payments for ecosystem services (PES) programs have shown promise in reducing burning by compensating for foregone savings, but without sustained incentives, farmers revert to burning as the low-risk, immediate choice, highlighting a trade-off between environmental mandates and agrarian viability where alternatives demand systemic support beyond sporadic subsidies.^[52]^[49] This dynamic underscores how burning persists not merely from habit but from rational prioritization of cash flow and operational simplicity in a high-stakes cropping calendar.

Recent Trends and Outcomes

Declines in Practice and Influencing Factors

Stubble burning incidents in Punjab decreased by 85% from 71,304 cases in 2021 to 10,909 in 2024, according to state government records.^[115] In the period from September 15 to October 21, 2025, Punjab reported 415 incidents, compared to 4,327 in the same window of 2021.^[116] Haryana experienced a 95% decline, with only 30 farm fires recorded until October 17, 2025, versus 601 in the prior year.^[117] Across northern India, stubble burning fell 68% between September 15 and October 16, 2025, with Punjab alone showing an 84% reduction.^[118] Punjab's incidents dropped 96% from 2020 to 2025 levels.^[119] Satellite observations, including NASA data, indicate unusually low fire detections in Punjab and Haryana in 2024, though air quality remained poor, suggesting potential undercounting or shifts in burning patterns.^[120] In 2024, Punjab's farm fire incidents fell 70%, but the total burnt area increased, highlighting limitations in incident-based metrics over area-based assessments.^[121] Farmers have reportedly timed burns to evade satellite overpasses, such as avoiding peak detection windows around 4 p.m., which may contribute to discrepancies between official counts and remote sensing data.^[122]^[123] Key factors driving these declines include government subsidies for crop residue management machinery, such as super seeders and balers, which enable in-situ incorporation of stubble into soil, reducing the need for burning.^[124] State schemes in Punjab and Haryana provide financial incentives and custom hiring centers for equipment access, particularly benefiting smallholder farmers who lack resources for individual purchases.^[125] Stricter enforcement of penalties, including fines up to ₹1 lakh per incident under the Air (Prevention and Control of Pollution) Act, has deterred violations, though implementation varies by district.^[49] Performance-linked incentives for local officials, tied to reduced fire counts, have prompted proactive monitoring and machinery distribution, with evidence showing fires rise when winds favor cross-jurisdictional pollution evasion.^[83] Adoption of alternatives has accelerated due to awareness campaigns addressing soil health benefits of residue retention, countering prior misconceptions about yield losses from non-burning methods.^[125] However, persistent socio-economic pressures, such as tight harvest windows between paddy and wheat cycles, limit full compliance, with enforcement gaps allowing some evasion tactics to persist.^[84]

Evaluation of Intervention Effectiveness

Interventions to curb stubble burning in India, primarily targeting Punjab and Haryana, encompass regulatory bans, subsidies for in-situ machinery like happy seeders and super straw management systems, promotion of ex-situ processing, and enforcement mechanisms including fines and monitoring. Evaluations based on satellite-detected fire counts from NASA and ISRO indicate partial short-term reductions, with Punjab reporting a decline from 76,590 incidents in 2020 to approximately 10,909 by late 2024, attributed to subsidized equipment distribution exceeding 100,000 units and custom hiring centers.^[126]^[127] However, these gains often diminish over time, as evidenced by a 30% initial drop in fire counts following Punjab's 2019 ban, which faded to near zero effect within 2-3 years due to lax enforcement and persistent economic incentives for burning.^[55] Incentive-based approaches show greater sustained impact. A randomized controlled trial of conditional cash transfers in Punjab demonstrated significant reductions in burning through payments for ecosystem services, linking farmer compensation to verified non-burning practices and yielding measurable air quality improvements.^[52] Similarly, performance-linked incentives for district bureaucrats, introduced in 2022, correlated with a 20-30% decrease in local fire incidents and associated child mortality reductions of up to 15%, by enhancing monitoring and coordination during peak seasons.^[83] These results underscore that aligning administrative accountability with outcomes outperforms punitive measures alone, though scalability remains limited by bureaucratic capacity. Despite policy targets for 100% residue management by 2024, effectiveness is hampered by detection gaps and farmer non-compliance. Satellite data underestimates fires, as farmers increasingly time burns post-satellite overpass times (e.g., after 4 PM), leading to discrepancies where reported declines (e.g., 71% in Punjab from 2020-2024) do not match persistent smog levels in Delhi.^[128]^[127] Ground validations and court-mandated 24x7 monitoring reveal ongoing hotspots, with Punjab recording over three-fold increases in incidents within short periods in October 2025, signaling incomplete adoption of alternatives amid high machinery costs (₹1,500-2,000 per acre) and soil health concerns from residue incorporation.^[126]^[20] Overall, while interventions have curbed roughly 50-70% of historical peaks in detected events, residual burning contributes 40-60% to seasonal PM2.5 spikes, necessitating techno-economic refinements and broader enforcement to achieve verifiable long-term efficacy.^[83]^[55]

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Data show Punjab farm fires fell by 70% in 2024, yet the ... - The Hindu
Oct 4, 2025 · Punjab saw a 70% decrease in farm fire incidents in 2024, but the burnt area increased, raising data accuracy concerns.Missing: NASA 2020-2024
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Exclusive: Wary Of NASA Satellites, How Farmers In Punjab Time ...
Nov 14, 2024 · The CAQM appreciated Punjab for making strenuous efforts to bring down the stubble-burning count by nearly 71 per cent as compared to last year.Missing: decline | Show results with:decline
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Delhi Pollution: How Punjab farmers are outsmarting world's most ...
Nov 18, 2024 · While the number of reported stubble fires has declined this year, some experts suggest that farmers might be altering their burning schedules ...
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[PDF] Strategies to reduce crop residue burning for air pollution mitigation
Shorter cropping cycles: Multiple cropping and shortened intervals between crops give a very short window of about 10–15 days during which the field needs to be ...Missing: techniques | Show results with:techniques
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6 Steps Punjab Farmers Can Take to Curb Paddy Stubble Burning
Nov 1, 2024 · Government steps include improving machinery access, supporting small farmers, countering misconceptions, direct incentives, and a minimum ...Missing: policies | Show results with:policies
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https://www.indiatoday.in/india/story/punjab-reports-over-three-fold-jump-in-stubble-burning-incidents-in-10-days-2806326-2025-10-21
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The discrepancy between satellite data of farm fires and air pollution
Nov 24, 2024 · But the CAQM has also maintained that its efforts have lowered the prevalence of fires by 71% in Punjab and 44% in Haryana between 2020 and ...
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"Stubble Burning After 4 pm": Supreme Court Asks For 24x7 Data On ...
Nov 28, 2024 · Supreme Court ordered 24x7 data on stubble burning in Punjab and Haryana after farmers started timing the crop burning with the overpass of NASA satellites ...Missing: trend 2018-2025