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Farmyard Manure (FYM) and Cow Dung

Farmyard manure (FYM) is decomposed cattle dung, urine-soaked bedding and crop residue, traditionally produced through 4-6 months of pit composting. It is the oldest and most widely used organic soil amendment in Indian agriculture, valued not only for its nutrient content but for its contribution to soil organic matter, structure, water-holding capacity and microbial biomass.

Composition

On a fresh-weight basis, well-decomposed FYM contains:

  • Nitrogen: approximately 0.5% N
  • Phosphate: approximately 0.2% P2O5
  • Potash: approximately 0.5% K2O
  • Organic carbon: 15-30% on dry-weight basis

Most of the phosphate and potash are available in the first season; nitrogen is mineralised gradually and contributes over multiple seasons. Actual analysis varies widely with feed source, storage method and degree of decomposition.

Mode of action

FYM serves three concurrent functions in soil: as a slow-release nutrient source, as a substrate for soil microorganisms, and as a structural amendment that improves aggregation, infiltration and water retention. Microbially mediated mineralisation releases plant-available nutrients in pace with crop demand, while humified organic matter binds cations on cation-exchange sites, reducing leaching losses.

Target use and dose

The recommended basal application is generally 5-10 t per hectare across most field and horticultural crops, applied two to three weeks before sowing or transplanting and incorporated. Higher doses (10-25 t/ha) are common in vegetable, banana, sugarcane and orchard systems. FYM is the cornerstone of the ICAR Integrated Nutrient Management framework, in which it is combined with reduced rates of chemical fertilisers to improve nutrient-use efficiency.

Safety and adoption

Universally adopted in Indian smallholder agriculture. Hygiene cautions apply to fresh dung, which should be matured before application to avoid seed contamination and nitrogen immobilisation. Pit storage with weekly turning and adequate moisture maximises nutrient retention; uncovered heap composting loses 30-50% of nitrogen to volatilisation.

See also: Vermicompost, Vermiwash, Jeevamrutham Drava, Ghana Jeevamrutham, Panchagavya, Waste Decomposer Ncof.

References

  1. Manures. Vikaspedia agriculture portal.
  2. FYM Pit Nutrient Mass Balance. ICAR Krishi publication repository.