NADEP Composting

The recommended size of the tank is 10 ft length by 5 ft width by 3 ft height. All the four walls of the NADEP tank have 6 inch vents (created by removing every alternate brick after the height of 1ft. from bottom for aeration), and the tank may be constructed with mud mortar or cement. For good quality compost, the entire tank should be filled within 24 hours and not beyond 48 hours. Initial materials include agricultural waste (Dry & green): 1350-1400 kgs, cattle dung or biogas slurry:  98 – 100 kgs, fine-sieved soil: 1675 kgs, water: 1350-1400 liters.

These materials are added in layers:

• Sub-layer-1: 4 to 6 inch thick layer of fine sticks, stems, followed by 4 to 6 inch layer of dry and green biomass.
• Sub-layer-2: 4 kgs cow dung is mixed with 100 liters of water and sprinkled thoroughly on the agricultural waste.
• Sub-layer-3: 60 kgs of fine dry soil is spread uniformly over the soaked biomass.
• Fill approximately 10 -12 layers using this method, and cover with 3 inches of thick layer of soil and seal with cow dung and mud plaster. Cover the tank with a thatched roof.

After 15-30 days add 2-3 additional layers, and moisten every 6-15 days. Decomposition time is 90-120 days.

There is no technical support provided and users are expected to maintain the product on their own.

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Testing by S.V.P University assessed nutrient retention, S.K. Rajasthan Agricultural University assessed carbon loss, and additional testing for S.V.P. University assessed weed recycling through NADEP composting.

Implementers must take appropriate precautions when working with organic waste, particularly cattle dung, and ensure complete decomposition.