Theory:

The manures which are predominantly derived from plant debris, animal faeces and microbes are known as organic manures. These manures increase the fertility of the soil by adding nutrients like nitrogen. Some of the organic manures are listed below:
Animal manure:
The manure that comprises faeces and urine from livestock like cattle, horses, pigs, sheep,
chickens, turkeys, rabbits is known as animal manure. The quality and applications differ based on the animal from which the manure is obtained.
  
Farmyard manure:
  
This manure is a mixture of cattle dung, urine, litter material and other dairy wastes. On average, the farmyard manure, which is well decomposed, contains \(0.5\)% Nitrogen, \(0.2\)% available phosphate and \(0.5\)% available potash. It is the most common form of organic manure applied in the mid-hills of Nepal.
This manure is a valuable soil improver that enhances and restores a range of natural properties of the soil.
Sheep and goat manure:
  
It is a manure that contains higher nutrients than farmyard manure. It comprises of \(3\)%Nitrogen, \(1\)%phosphorous pentoxide and \(2\)% of potassium oxide.
 
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Animal and farmyard manure
Compost:
A solid conditioner, as well as a fertilizer that is rich in nutrients is known as compost.
It is produced by the natural decomposition of organic matter such as crop residues, animal wastes, industrial wastes, food wastes and municipal wastes by microorganisms under controlled conditions.
 
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Composting
Green manure:
The manure obtained by the collecting and decomposition of green leaves, twigs of trees, field bunds etc., is known as green manure.
This manure improves the structure of the soil by increasing the water holding capacity and decreases soil loss by erosion. This manure also helps in the restoration of alkaline soils and reduces weed proliferation. Green manure is obtained from the undecomposed green material of leguminous plants such as Sunhemp (Crotolaria juncea), Dhaincha (Sesbania aculeata), Sesbania (Sesbania speciosa).
 
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Green manure