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Soil Organic Matter

Soil Organic Matter 
Defined as the organic fraction of soil including plant, animals and microbial residues at fresh varying stage of decomposition and relatively resistant humus.
Properties 
Soil texture 
Soil structure 
Moisture holding capacity 
Diversity and activity of soil organisms 
Nutrient availability 
Source 
Plant tissue  (plant roots, stubble, leaves, mulch )
Animal usually considered secondary sources, contribute waste products which are consummated.
Crop residues  (Rice straw, corn straw, sugarcane trashes, cassava leaves )
Green manuring crops, farm yard manure
Compost
Sewege sludge
Micro-organisms: algae, fungi, lichen, mycorrhiza.
Earthworms, termites and ants play an important role

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