Stubble Burning — Revision Notes
⚡ 30-Second Revision
- What: — Burning crop residue (stubble) after harvest.
- When: — Primarily Oct-Nov (post-Kharif paddy harvest).
- Where: — Punjab, Haryana, Western UP.
- Why: — Quick field clearance, low cost, short sowing window.
- Impact: — Severe air pollution (PM2.5, Black Carbon), soil degradation, health issues, reduced visibility.
- Solutions (In-situ): — Happy Seeder, Super Seeder, Pusa Bio-decomposer.
- Solutions (Ex-situ): — Baling for biomass, fodder, paper, bio-ethanol.
- Legal: — Environment Protection Act 1986, NGT orders, Supreme Court directives, CAQM.
- Monitoring: — NASA VIIRS, SAFAR, CPCB.
- Key Challenge: — Economic viability of alternatives for farmers, MSP linkage.
2-Minute Revision
Stubble burning, the post-harvest practice of igniting crop residue, is a critical environmental and health challenge in North India, peaking in October-November after the paddy harvest. Driven by the need for rapid field preparation for the subsequent wheat crop, it leads to massive emissions of PM2.
5, black carbon, and other pollutants, significantly contributing to Delhi-NCR's winter air pollution. This practice degrades soil health by destroying organic matter and beneficial microbes. Solutions are categorized into in-situ (on-field) methods like the Happy Seeder (sowing directly into stubble) and Pusa bio-decomposer (accelerating decomposition), and ex-situ (off-field) methods such as baling for biomass energy or industrial use.
Despite legal bans by the NGT and stringent directives from the Supreme Court, and various government subsidies for machinery, the problem persists due to economic pressures on farmers, the high cost of alternatives, and the lack of robust market linkages for crop residue.
Effective management requires a multi-pronged approach combining technological solutions, economic incentives, policy reforms (including MSP review), and strong enforcement.
5-Minute Revision
Stubble burning, or crop residue burning, is the intentional burning of leftover straw and plant material in agricultural fields, predominantly in Punjab, Haryana, and Western Uttar Pradesh, following the Kharif (paddy) harvest in October-November.
This practice is driven by the farmers' need for quick, cost-effective field clearance for the subsequent Rabi (wheat) crop, especially given the short window and the residue left by combine harvesters.
The environmental impact is severe: it releases a cocktail of pollutants including PM2.5, PM10, Black Carbon, CO, NOx, and SO2, which drastically deteriorate air quality, particularly in Delhi-NCR due to transboundary transport by north-westerly winds and stable atmospheric conditions.
It also contributes to climate change and significantly degrades soil health by destroying organic matter and beneficial microorganisms. Public health suffers from increased respiratory and cardiovascular diseases.
Solutions involve both in-situ and ex-situ methods. In-situ techniques include using Happy Seeders, Super Seeders, and Zero-Till Drills to incorporate stubble into the soil or sow directly, and applying bio-decomposers like the Pusa bio-decomposer to accelerate decomposition.
Ex-situ methods focus on collecting stubble for alternative uses such as biomass power generation, fodder, paper manufacturing, or bio-ethanol production. The legal framework, primarily under the Environment (Protection) Act, 1986, is bolstered by numerous NGT orders and Supreme Court directives, with the CAQM playing a coordinating role.
However, challenges persist due to the high cost of alternatives, limited market for paddy straw, MSP policies incentivizing the paddy-wheat cycle, and issues of farmer awareness and political will. A comprehensive strategy must integrate technological solutions, economic incentives, policy reforms, and robust enforcement, drawing lessons from international experiences like China's successful ban coupled with subsidies and market development.
Prelims Revision Notes
- Definition: — Intentional burning of crop residue post-harvest (paddy, wheat). 2. Season: Predominantly Oct-Nov (post-Kharif). 3. States: Punjab, Haryana, Western UP (major contributors). 4. Causes: Quick field clearance, low cost, short sowing window, combine harvester residue, lack of alternatives. 5. Pollutants: PM2.5, PM10, Black Carbon, CO, NOx, SO2, VOCs, Methane. 6. Impacts: Air pollution (Delhi-NCR smog), soil degradation (organic matter, microbes), health issues (respiratory, cardiovascular), reduced visibility, climate change (GHGs, BC). 7. In-situ Solutions: Happy Seeder (sows in stubble), Super Seeder, Zero-Till Drill, Mulcher, Pusa Bio-decomposer (microbial spray for decomposition). 8. Ex-situ Solutions: Baling (biomass power, fodder, paper, bio-ethanol). 9. Legal Framework: Environment Protection Act, 1986; NGT orders (ban, incentives); Supreme Court directives (monitoring, long-term solutions); CAQM (enforcement). 10. Monitoring: NASA VIIRS (fire counts), SAFAR (AQI prediction), CPCB. 11. MSP Linkage: Incentivizes paddy, leading to more stubble. 12. Atmospheric Factors: North-westerly winds, shallow ABL, temperature inversions aid pollutant transport. 13. Black Carbon: Potent climate forcing agent from incomplete combustion. 14. Secondary Aerosols: Formed from NOx, VOCs. 15. Health: Attributable premature deaths (ICMR 2021).
Mains Revision Notes
- Problem Statement: — Stubble burning as a complex socio-economic-environmental challenge. 2. Root Causes: Agronomic (combine harvester, short window), Economic (cost of alternatives, lack of market for straw, MSP for paddy), Social (labour scarcity, farmer awareness), Political (implementation gaps, inter-state coordination, electoral considerations). 3. Multi-dimensional Impact: Detailed analysis of environmental (air, soil, climate), economic (productivity loss, healthcare burden), and public health consequences. 4. Policy Evaluation: Critical assessment of government initiatives (subsidies, bio-decomposer rollout, CAQM) and judicial interventions (SC, NGT). Discuss effectiveness, challenges in implementation, and farmer acceptance. 5. Technological Solutions: In-depth understanding of Happy Seeder, Pusa bio-decomposer, and ex-situ options. Analyze their potential, limitations, and scalability. 6. Governance Challenges: Inter-state disputes, enforcement mechanisms, role of local administration. 7. Political Economy: How economic incentives (or lack thereof) override environmental concerns for farmers. The 'tragedy of the commons' analogy. 8. Comprehensive Solutions Framework: Propose integrated solutions encompassing: a) Technological access & affordability: Subsidies, custom hiring centres. b) Economic incentives: Direct payments for non-burning, market development for straw. c) Policy reforms: MSP review, crop diversification. d) Behavioural change: Farmer education, community engagement. e) Stronger enforcement & monitoring: Leveraging technology, inter-state cooperation. 9. International Best Practices: Lessons from China (ban + subsidies), EU (cross-compliance), US (no-till). 10. Vyyuha Analysis: Emphasize the intersection of agricultural economics and environmental policy, focusing on systemic changes.
Vyyuha Quick Recall
Remember the core aspects of stubble burning with STUBBLE:
- Seasonal: Peaks in Oct-Nov after paddy harvest.
- Technology gap: Lack of affordable, accessible Technological alternatives.
- Uneconomical alternatives: Current solutions are often Unprofitable for farmers.
- Biomass burning: Releases Black Carbon, PM2.5, and other pollutants.
- Breathless cities: Major cause of Bad air quality in Delhi-NCR.
- Legal interventions: Laws, NGT, and SC orders are in place.
- Economic solutions needed: Requires Economic incentives and market linkages.