Question

......soil contains large proportion of organic material
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Answer 1

organic matter content of the soil. Most soil organic matter originates from plant tissue. Plant residues contain 60-90 percent moisture. The remaining dry matter consists of carbon (C), oxygen, hydrogen (H) and small amounts of sulphur (S), nitrogen (N), phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg).

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Answer 2

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topsoil contains large proportion of organic material .