A field experiment conducted with different N levels, ZnSO4 sulphur, herbicide, organic manures, applied to the preceeding rice crops revealed that the residual effect of NPK plus organic manure particularly FYM significantly increased the available N, P and K contents of soil. The highest grain and haulm yield of black gram was obtained in the 100 per cent NPK plus ZnSO4 applied once in a cropping sequence. The N, P, K uptake was highest in the same treatment.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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