Attempts ware made to evolve suitable crop sequence for Vaigai Periyar Command Area to maximise the production under resource constraints. An early maturing rice variety for the 1st crop (June-September) followed by a medium duration for the lind crep (September-October to January-February) was found to be the best fit. Irrigation of 5 cm submergence to hairline crack which approximate to 0.3 atmospheric tension was as good as continuous submergence resulting in a saving of 41 per cent in irrigation water. This alternate wetting and drying resulted in increased water use efficiency with grain production of 52 kg/ha cm water used. Among the three levels of manuring tried 100:50:50: kg N. PO, and K.0/ha was found to be more economic.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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