➢ These manures contain essential plant nutrients (macro and micronutrients). They have a direct effect on plant growth like any other commercial fertilizers.

➢ Organic manures increase OM content of the soil hence improves the physical properties of soils.

➢ Organic manures provide food for microorganism of soils. So, activity of microorganisms increased which enhances the processes which convert unavailable plant nutrients into available form.

➢ Organic manures increases the humus content of the soil. Biochemical processes are increased. So, chemical properties are increased.