To find out the effect of four schedules of irrigation. 50 mm irrigation based on IW/PAN-E ratio of 0.5, 0.7. 0.9 and 1.1; two rates of stover mulch, 0 and 20 t/ha and two concentrations of cycocel, 0 and 0.03 per cent on the yield and water use of sunflower, a field experiment was conducted on clay loam soil during summer 1976 and 1977. Scheduling irrigation based on IW/PAN-E ratio of 0.7 for entire season. gave maximum seed yield with higher water use efficiency. Stover mulching in summer increased the crop yields with greater water use efficiency. The retarding effect of cycocel on morphological characters ultimately minimized water use and helped in boost- ing up the seed yield.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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