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manure
Manure is organic matter, mostly derived from animal feces except in the case of green manure, which can be used as organic fertilizer in agriculture. Manures contribute to the fertility of the soil by adding organic matter and nutrients, such as nitrogen, that are trapped by bacteria in the soil. Higher organisms then feed on the fungi and bacteria in a chain of life that comprises the soil food web. It is also a product obtained after decomposition of organic matter like cow dung which replenishes the soil with essential elements and add humus to the soil.
In the past, the term “manure” included inorganic fertilizers, but this usage is now very rare.
==Types==
There are three main classes of manures used in soil management:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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