delimitation of soil
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Soil is a material found on the surface of the earth that is composed of organic and inorganic material. Soil varies due to its structure and composition.
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soil microorganisms can take up these nutrients from soil, the extent of nutrient limitation depends on soil fertility. Nutrients such as P, potassium (K), calcium (Ca), or magnesium (Mg) decrease steadily with ongoing rock weathering and soil development (Walker and Syers 1976, Vitousek and Sanford 1986).
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