Stubble Burning – Causes & Consequences – Explained Pointwise

Stubble burning has emerged as a major environmental and public health concern in North India, particularly during the post-harvest season. Driven by time constraints, technological limitations and economic compulsions, the practice contributes to seasonal air pollution, highlighting the need for sustainable crop residue management.

What is stubble burning?

• Stubble burning refers to the practice of setting fire to the leftover crop residues, such as paddy stubble, after harvesting to clear fields quickly for the next cropping cycle.
• It is widely practised in Punjab, Haryana and Uttar Pradesh, particularly after paddy harvesting, and contributes to air pollution in northern India.

What are the major causes of stubble burning in India?

1. Short window between crops: Farmers in Punjab and Haryana have limited time between paddy harvesting and wheat sowing. To prepare fields quickly for the next crop, they often resort to stubble burning as a cheap and time-saving method.
2. High cost of alternatives: Machinery for crop-residue management, such as Happy Seeders and Super SMS systems, involves high purchase and operational costs, making it difficult for small and marginal farmers to adopt these alternatives.
3. Labour shortage: The migration of agricultural labourers to urban areas and rising labour costs make manual removal of crop residue difficult and expensive. Consequently, farmers often resort to stubble burning as a quick and low-cost method of clearing fields.
4. Mechanised harvesting: Combine harvesters cut and thresh crops quickly but leave large quantities of stubble and loose crop residue in the fields. Its removal requires additional machinery, time and expenditure, encouraging farmers to burn the residue as a quick and inexpensive method of field clearance.
5. Monocropping pattern: The widespread cultivation of paddy in Punjab, Haryana and western Uttar Pradesh generates large quantities of crop residue after harvesting, making its timely disposal a major challenge for farmers.
6. Lack of economic incentives: Crop residue management involves additional costs for machinery, labour, transportation and storage, while farmers often receive little immediate financial return from alternative uses of stubble. Consequently, burning remains a cheaper and quicker option for many farmers.
7. Groundwater and policy factors: Policies such as the Punjab Preservation of Subsoil Water Act, 2009, delayed paddy transplantation to conserve groundwater. However, this also delays harvesting, leaving farmers with a shorter window to prepare fields for wheat sowing. For e.g. farmers in Punjab and Haryana may resort to stubble burning to clear fields quickly before the next cropping season.

What are the environmental and health impacts of stubble burning?

Environmental Impacts:

1. Air pollution: Stubble burning releases large quantities of particulate matter (PM2.5 and PM10), carbon monoxide and other pollutants, deteriorating air quality. For e.g. smoke from paddy-residue burning in Punjab and Haryana contributes to seasonal air pollution in Delhi-NCR, particularly during October-November.
2. Greenhouse gas emissions: Stubble burning releases greenhouse gases such as carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O), which contribute to global warming and climate change. For e.g. burning paddy residue in Punjab and Haryana releases these gases into the atmosphere, adding to India’s agricultural emissions and worsening the climate impact of farming.
3. Soil degradation: Stubble burning destroys beneficial soil microorganisms, reduces organic matter and adversely affects soil structure and fertility. Repeated burning can weaken long-term soil health and increase dependence on chemical fertilisers.
4. Loss of soil nutrients: Stubble burning destroys organic matter and causes the loss of essential nutrients, particularly nitrogen and sulphur, reducing long-term soil fertility. For e.g. repeated burning of paddy residue in Punjab and Haryana can degrade soil health, increasing farmers’ dependence on chemical fertilisers to maintain crop productivity.
5. Biodiversity loss: Stubble burning destroys the habitats of insects, earthworms and other small organisms, disrupting local food chains and reducing ecological balance.

Health Impacts:

1. Respiratory diseases: Stubble burning releases fine particulate matter (PM2.5) that penetrates deep into the lungs, aggravating asthma, bronchitis and chronic obstructive pulmonary disease (COPD). During the paddy-harvesting season, deteriorating air quality in Delhi-NCR can worsen breathing difficulties, particularly among children, older people and those with pre-existing respiratory conditions.
2. Cardiovascular problems: Exposure to fine particulate matter (PM2.5) released during stubble burning can enter the bloodstream and trigger inflammation, oxidative stress and increased blood pressure, raising the risk of heart attacks, strokes and other cardiovascular diseases.
3. Eye and throat irritation: Smoke from stubble burning contains particulate matter and irritant gases that cause burning eyes, watery eyes, sore throat and persistent coughing.
4. Reduced quality of life: Prolonged exposure to smoke from stubble burning causes discomfort, disrupts outdoor activities, reduces productivity and may lead to school closures during severe pollution episodes. It also increases healthcare expenses and disproportionately affects vulnerable communities.

What are the major challenges in controlling stubble burning?

1. Difficulty in Penalizing Farmers: While local authorities impose fines and log satellite-detected farm fires in revenue records, enforcing penalties on a large scale is politically sensitive and socially difficult, as small farmers often view burning as an economic compulsion rather than a choice.
2. Inter-State Coordination: Controlling air pollution across the Indo-Gangetic Plains requires effective coordination among Punjab, Haryana, Uttar Pradesh, Rajasthan, Delhi and the Central Government, which is often hindered by political and administrative challenges.
3. High Cost of Machinery: Crop residue management machines, such as Happy Seeders and Super Seeders, are expensive. Despite government subsidies (which is ranging from 50% to 80%), their cost remains a financial burden for small and marginal farmers.
4. Pest and Germination Issues: Farmers fear that paddy straw left on fields may increase pest attacks, such as pink stem borer, and affect uniform seed germination if sowing machinery is not used properly.

What steps has the Government taken to address stubble burning?

1. Crop Residue Management (CRM) Scheme: Provides financial assistance for purchasing crop-residue management machinery and establishing Custom Hiring Centres (CHCs), making equipment accessible to farmers.
2. Subsidies on agricultural machinery: Provides a 50% subsidy to individual farmers and up to 80% assistance to eligible farmer groups and organisations for establishing CHCs. Machines include Happy Seeders, Super Seeders and Smart Seeders.
3. In-situ crop residue management: Promotes incorporating or retaining stubble in the soil using suitable machinery, improving soil health and reducing the need for burning.
4. Ex-situ crop residue utilisation: Encourages the collection and use of paddy straw in biomass power plants, industrial boilers, biofuel production and other applications, creating economic value from agricultural waste.
5. Satellite-based monitoring: Uses satellite remote sensing to detect and monitor farm fires, helping authorities identify burning incidents and take timely action.
6. Commission for Air Quality Management (CAQM): Issues directions and coordinates action plans among Punjab, Haryana, Uttar Pradesh, Rajasthan and Delhi to prevent crop-residue burning and reduce regional air pollution.
7. Bio-decomposer technology: The government promotes microbial bio-decomposers that accelerate the decomposition of paddy straw in fields, converting crop residue into organic manure. For e.g. the Pusa Bio-Decomposer developed by ICAR helps farmers manage stubble without burning, improving soil health and reducing air pollution.
8. Awareness campaigns: The government conducts awareness campaigns through agricultural departments, Krishi Vigyan Kendras (KVKs) and local authorities to educate farmers about the harmful effects of stubble burning and promote sustainable alternatives, such as mulching and crop-residue management machinery.
9. Enforcement and penalties: State governments impose environmental compensation on farmers who engage in stubble burning. Satellite-based monitoring helps identify farm fires, while local authorities monitor violations and enforce penalties to discourage the practice.

What should way forward to effectively address the problem of stubble burning?

1. Promote affordable machinery: Provide subsidised crop-residue management machines, such as Happy Seeders and Super Seeders, to small and marginal farmers.
2. Strengthen Custom Hiring Centres: Expand access to affordable machinery through cooperatives, Farmer Producer Organisations (FPOs) and village-level hiring centres.
3. Provide financial incentives: Offer direct incentives to farmers for adopting sustainable residue management practices instead of relying solely on penalties.
4. Promote ex-situ utilisation: Encourage the use of paddy straw in biomass power plants, compressed biogas (CBG) production, biofuels and industrial boilers.
5. Diversify cropping patterns: Encourage farmers to shift from water-intensive paddy cultivation towards less water-intensive crops through assured procurement, price support and suitable market linkages.
6. Improve interstate coordination: Ensure coordinated action among Punjab, Haryana, Uttar Pradesh, Rajasthan, Delhi and the Central Government to address regional air pollution.

Conclusion: Stubble burning is not merely an agricultural challenge but a serious environmental and public health concern. A shift from burning crop residue to utilising it as a resource is essential for achieving sustainable agriculture and cleaner air in India.