Abstract

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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