Major categories of agricultural organic fertilizers
Organic soil amendments range from bulky decomposed animal manures to concentrated organic cakes and microbial inoculants.
- Bulky organic manures: Well-decomposed farmyard manure (FYM), press mud compost, poultry manure, and earthworm vermicompost.
- Concentrated organic manures: Neem cake, castor cake, mustard cake, bone meal, and fish meal rich in nitrogen and phosphorus.
- Bio-fertilisers: Nitrogen-fixing bacterial inoculants (Rhizobium, Azotobacter, Azospirillum) and Phosphate Solubilizing Bacteria (PSB).
- Green manures: Biomass crops like sunn hemp (Crotalaria juncea) and dhaincha (Sesbania bispinosa) ploughed into soil before flowering.
Soil physical, chemical, and biological benefits
Continuous organic inputs improve the overall biological health and physical structure of agricultural soils.
- Enhanced soil structure: Increases soil porosity, aeration, and water infiltration while curbing surface crusting.
- Elevated moisture-holding capacity: Organic humus holds several times its weight in moisture, buffering crops against dry spells.
- Microbial proliferation: Supplies carbon energy to native soil microbes, beneficial fungi, and mycorrhizae.
- Nutrient buffering: Enhances Cation Exchange Capacity (CEC) and slowly releases micronutrients throughout crop development.
Application timing and composting stewardship
Apply bulky organic manures 3 to 4 weeks prior to sowing during preparatory land tillage to allow thorough microbial integration. Ensure all animal manures are fully decomposed to eliminate weed seeds and root-rot pathogens. In certified organic production, use inputs approved under National Standards for Organic Production (NSOP).
Official source
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National Centre of Organic and Natural Farming ↗Related on KisanPe
Common questions
What is the primary benefit of applying vermicompost over raw manure?
Vermicompost is thoroughly decomposed, rich in plant-available nutrients and beneficial microbes, and free from live weed seeds or pathogens.
How does neem cake benefit agricultural soils?
Neem cake supplies organic nitrogen while inhibiting soil-dwelling nematodes and slowing down nitrogen leaching through nitrification inhibition.
When should green manure crops like dhaincha be ploughed under?
Incorporate green manure crops into the soil at 45 to 55 days after sowing, just prior to flowering, when vegetative biomass is tender.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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