Classification of organic manures

1. Bulky organic manures:

• contain little amount of plant nutrients and are bulky in nature as compared to concentrated organic manures.
• These are FYM, Compost (rural and town compost) green manures eg. dhaincha, glyricidia and other leguminous crops, night soil (excreta of human), sewage i) Sludge (semi solid part of sewage or open toilet) and ii) Sullage (liquid of kitchen, bath room and urine etc).

2. Concentrated organic manures

• derived from raw materials of animal or plant origin which are less bulky and those containing higher percentage of major plant nutrients than bulky organic manures.
• These are oil cakes i) Edible to cattle (e.g. mustard oil cake, ground nut oil cake etc.) and ii) Non edible to cattle (e.g. mahua, neem cakes, caster cakes etc.), blood meal, meat meal, bone meal etc.