essential plant nutrients, their sources and transformation chemistry in soil; organic manures, chemical fertilizers and biofertilizers, ion exchange reactions and chemical equilibria in soil, soil biology and chemistry of related soil processes; soil erosion and its impact on soil fertility; problem soil
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essential plant nutrients, their sources and transformation chemistry in soil; organic manures, chemical fertilizers and biofertilizers, ion exchange reactions and chemical equilibria in soil, soil biology and chemistry of related soil processes; soil erosion and its impact on soil fertility; problem soil
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