The NADEP method of composting involves constructing a permanent, rectangular brick tank for composting a wide range of organic materials over 90-120 days. The tank is filled in layers consisting of dry/green plant materials, cow dung or biogas slurry, and sieved soil, and is sealed to retain moisture for 3 months to produce 2.5 tons of compost fertilizer as an alternative to farmyard manure. This method reduces costs, improves soil fertility, and supports organic farming through compost production without external inputs.