The earlier concepts on the activity of soil were for the most part based upon analyses of (or experiments with) the whole soil. It has long been considered that besides organic matter, the only other important fraction which assists crop growth is the clay which takes part in the exchange capacity and the fertility of the soil. The coarser silt and sand fractions were considered until recently as almost inert.
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Madras Agricultural Journal (MAJ)
Madras Agricultural Students Union
Tamil Nadu Agricultural University
Coimbatore - 641
003
Tamil Nadu, India.
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