Biology and process of aerobic composting
- Carbon to Nitrogen (C:N) balance: Mix brown carbon-rich materials (dry straw, leaves, sawdust) with green nitrogen-rich materials (cattle dung, green weeds, vegetable trimmings) in an approximate 30:1 initial ratio.
- Moisture and aeration: Maintain 50 to 60 percent moisture in the compost heap and turn the pile every 10 to 14 days to provide oxygen to aerobic bacteria.
- Temperature phases: Microorganisms generate heat, raising internal pile temperature to 55-65°C, which destroys weed seeds and harmful pathogens.
- Maturity indicator: Finished compost is dark brown or black, crumbly in texture, and possesses a pleasant earthy forest smell with a C:N ratio below 20:1.
Quality parameters under the Fertilizer (Control) Order
- Moisture content: Must remain between 15 and 25 percent by weight.
- Organic Carbon: Minimum 12.0 percent by weight.
- Total primary nutrients: Minimum 0.5% Nitrogen (N), 0.5% Phosphorus, and 0.5% Potassium.
- Heavy metal limits: Strict ceiling limits on arsenic, cadmium, lead, and chromium to ensure crop and consumer safety.
Field application and agronomic benefits
Incorporate well-decomposed compost into the soil during field preparation before sowing or transplanting. Applying compost regularly improves soil water infiltration, prevents surface crusting on clayey soils, reduces irrigation frequency, and provides slow-release plant nutrition throughout the crop cycle.
Official source
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National Centre of Organic & Natural Farming (NCONF) ↗Related on KisanPe
Common questions
How do I know when compost is fully matured and ready for use?
Mature compost has a dark brown, crumbly appearance, an earthy soil aroma, cool internal temperature, and no recognizable raw residue pieces.
What is the ideal C:N ratio for composting?
The ideal starting Carbon-to-Nitrogen ratio in a compost pile is approximately 30:1, which drops below 20:1 as the compost matures.
Where can I find official quality standards for compost in India?
Standards for city compost, vermicompost, and organic manures are notified under Schedule IV of the Fertilizer (Inorganic, Organic or Mixed) (Control) Order by the Ministry of Agriculture.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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