Organic manures contain mixtures of poultry litter, neem cake, pressmud, coirpith, etc with readily available plant primary and secondary nutrients.

Advantages:

-- They supply plant nutrients including micronutrients
-- They improve soil physical properties like structure, water holding capacity etc.,
-- They increase the availability of nutrients
-- Plant parasitic nematodes and fungi are controlled to some extent by altering the balance of microorganisms in the soil