The influence of irrigation regimes on uptake and balance sheet of nutrients was studied by conducting field experiments during kharif and rabi seasons of 1997. The highest levels of soil available nonitrogen, phosphorus and potassium as per balance sheet was recorded with irrigating 2.5 cm depth three days after disappearance of ponded water due to lower crop uptake. But the highest actual soil available nutrients was recorded with irrigating 5 cm depth one day after disappearance of ponded water except soil available potassium. The highest soil available potassium was recorded with irrigating 2.5 cm depth three days after disappearance of ponded water. The highest grain yield was recorded in plots received with od irrigation to 5 cm depth one day after disappearance of ponded water. Similarly, the same irrigation regime recorded the highest net returns and benefit cost ratio.
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Tamil Nadu Agricultural University
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