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Organic Matter (Importance (Fertility (Nutrient Source (N, S, P etc.)…
Organic Matter
Importance
Fertility
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Nutrient Source (N, S, P etc.)
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Formation, distribution and amounts
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Composition
Derived from degrading biological material (plants, animals, micro-organisms)
Carbon, nitrogen, phosphorus, sulphur, oxygen, hydrogen
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Varies between land use - as land use becomes more intensive, nitrogen inputs increase, nitrogen accumulates in organic matter and C:N goes down - more intensive land use, more nitrogen fertilizer inputs, nitrogen fixation by clover
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Formation
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Storage is a balance of additions derived from photosynthesis and losses from decomposition/respiration
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