a. Cörnpost : Compost is a maiure prepáred from farm and town waste like vegetable and animal waste, sewage waste, weeds and straw. Compost is made by buçying all the waste ¡n’a pit with alternate layers of soil This organic nmtter is decomposed by both aerobic and anaerobic microorganisms. This process is called composting. Compost is rich in organic nutrients hut not as important as nutrients like nitrogen, phosphorus and potassium.