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Organic residue mulching (Achhadana)

Organic residue mulching (achhadana) is the practice of maintaining a permanent organic soil cover using crop residues, paddy straw, coconut fibre, palm fronds or other plant biomass laid on the surface around standing crops or in fallow blocks. It is one of the four pillars of Subhash Palekar Natural Farming and aligns with the FAO Conservation Agriculture framework.

Principle

Bare soil loses moisture rapidly through evaporation, suffers wide diurnal temperature swings, develops weed pressure under sunlight and is exposed to rain-splash erosion. An organic mulch layer addresses each: it intercepts solar radiation before it reaches the soil surface, blocks evaporative loss, shades weed seeds and breaks raindrop impact. As the mulch decomposes it adds organic carbon and slow-release nutrients to the soil profile.

Implementation

Within Palekar's Zero Budget Natural Farming doctrine, achhadana is one of four wheels alongside jeevamrutham, beejamrutham and waaphasa. The FAO Conservation Agriculture framework places permanent organic soil cover alongside minimum tillage and crop rotation as the three pillars of CA. Materials in practice include rice straw, wheat straw, sugarcane trash, sunn hemp residue, paddy husk, coconut fibre and freshly cut weed biomass. Cover thickness of 5-10 cm is typical.

Adoption context

Mulching has near-universal application across cropping systems but is most prominent in natural-farming horticulture, conservation-agriculture wheat-rice systems and dryland farming where soil moisture conservation is decisive. APCNF (Andhra Pradesh Community Managed Natural Farming) and KSCDA (Karnataka), among other state natural-farming programmes, mandate mulching as a basic practice.

Limitations

Mulch volumes required for permanent cover can exceed on-farm biomass supply, especially on small holdings. Termite and rodent pest pressure can increase under thick mulch. Application is labour-intensive. Slow nitrogen mineralisation from high-C/N mulches such as paddy straw can cause temporary N immobilisation in the soil profile.

See also Zbnf Zero Budget Natural Farming, In Situ Residue Decomposition, Green Manure Dhaincha, Sunn Hemp Green Manure and Sunn Hemp Green Manure 2.

References

  1. Importance of soil organic matter. Food and Agriculture Organization of the United Nations.
  2. Soil Carbon Sequestration. FAO World Soil Resources.