Production potential, water-use efficiency and economics of hybrid rice under different levels of irrigation and weed management practices

摘要

The effect of irrigation levels and weed management practices on yield, yield components, water-use efficiency and economics of hybrid rice (cv. Pro Agro 6444) was studied. The results revealed that continuous submergence of 5 ± 2 cm with weed free check (at fortnight interval) showed maximum grain yield (8.22 t ha~(-1)) and yield attributes. Continuous submergence with unweeded control consumed maximum water (153 cm) and lowest water-use efficiency (4.02 kg ha~(-1) mm~(-1)), while irrigation (5 cm)at 3 days after disappearance of ponded water with weed free check gave the maximum water-use efficiency (16.31 kg ha~(-1)mm~(-1)). The maximum net return (Rs.33,565 ha~(-1)) was obtained under continuous submergence with weed free check, however, the beneffi: cost ratio (1.94) was highest under continuous submergence with pre-emergence application of Pyrazosulfuron ethyl 10% WP@25 g ha~(-1) at 7 days after transplanting.