Government review and policy focus
Impact of Green Manuring on Soil Sustainability: The Tamil Nadu Government recently reviewed the outcomes of green manuring practices implemented under the Mannuyir Kaathu Mannuyir Kaappom Scheme. The review aimed to assess improvements in soil quality, crop productivity, and long-term sustainability across agricultural districts.
Green manuring was promoted as a core intervention to restore declining soil fertility caused by excessive chemical input usage. The initiative aligns with the state’s broader objective of encouraging eco-friendly farming methods.
Concept of green manuring
Green manuring refers to the cultivation of specific short-duration crops that are incorporated into the soil at a tender stage. These crops decompose naturally, enriching the soil with organic matter and essential nutrients.
Common green manure crops include sunhemp, dhaincha, and cowpea. They are grown before the main crop season and ploughed into the soil.
Static GK fact: Green manuring is a traditional agronomic practice used in India since ancient times to maintain soil fertility without synthetic inputs.
Distribution of green manure seeds
Under the scheme, green manure seeds were supplied free of cost to farmers across all districts of Tamil Nadu. This ensured uniform adoption of the practice irrespective of farm size.
Special focus was given to delta regions and irrigated tracts where soil nutrient depletion was high. Agricultural extension officers monitored sowing and incorporation stages.
Static GK Tip: Tamil Nadu has over seven major agro-climatic zones, making soil-specific interventions crucial for productivity.
Improvement in soil nutrient content
Impact studies revealed a measurable increase in soil nutrients, especially nitrogen, phosphorus, and potassium. The decomposition of green manure crops improved nutrient availability for subsequent crops.
Nitrogen fixation by leguminous green manure crops played a key role in reducing nutrient deficits. This reduced dependency on synthetic nitrogen-based fertilisers.
Enhanced soil structure and moisture retention
Fields practicing green manuring showed better soil aggregation and porosity. Improved soil structure enhanced root penetration and aeration.
Water-holding capacity increased significantly, particularly in paddy fields. This helped crops withstand short dry spells and improved irrigation efficiency.
Static GK fact: Paddy is a water-intensive crop requiring standing water for most of its growth period, making soil moisture retention critical.
Reduction in chemical fertiliser usage
Farmers adopting green manuring reported reduced application of chemical fertilisers. This lowered input costs and minimised soil and water pollution.
Sustained use of organic inputs also improved soil microbial activity. Healthier microbial populations support long-term soil productivity.
Contribution to sustainable farming
Green manuring supports sustainable agriculture by restoring natural soil processes. It balances productivity with environmental conservation.
The practice also complements organic and natural farming initiatives promoted by the state. It strengthens resilience against climate variability and soil degradation.
Static Usthadian Current Affairs Table
Impact of Green Manuring on Soil Sustainability:
| Topic | Detail |
| Scheme reviewed | Mannuyir Kaathu Mannuyir Kaappom Scheme |
| Implementing authority | Tamil Nadu Government |
| Core practice | Green manuring |
| Key nutrients improved | Nitrogen, phosphorus, potassium |
| Crop benefit observed | Paddy cultivation |
| Soil improvement | Better structure and water retention |
| Environmental impact | Reduced chemical fertiliser use |
| Long-term outcome | Sustainable and resilient farming |
