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Soil Characterisation Chemical
Soil is the medium from which plants normally derive their nutrients. The three main components of soil which provide nutrients for plant growth are the organic matter, the derivatives of parent rock materials and the clay fraction. The organic matter in soils is a potential source of N, P and S for plant growth.

Chemical Properties of Soil
The chemical properties of soils refers to the nature of the chemical changes taking place in them which in turn depend upon their chemical compositions and the nature of the inorganic and organic materials contained in them, which have originated from the gradual decomposition of the soil and organic materials, mainly of plant origin.