不同灌溉方式对水稻需水量和生长的影响

利用桶栽试验,研究了在不同灌溉方式及不同蒸发渗漏处理下的水稻需水量和对水稻生长的影响。结果表明:水稻以拔节孕穗期需水强度最高,无水层、干干湿湿和70%水分处理需水量分别比有水层处理减少42.5%、51.3%和57.6%;水稻叶面蒸腾量、棵间蒸发量与田间渗漏量占总耗水量的百分比分别为60.1%、16.4%和23.5%;干干湿湿处理水分利用率达到1.6 kg/m3,叶片光合速率最大,收获指数最高,从节水和增效的角度看,以干干湿湿灌溉最佳。

Effects of Different Irrigation Methods on Water Requirement and Growth in Paddy Rice

The water requirement and growth in paddy rice were studied under four different irrigation methods and different evaporation and seepage with pot culture.The results showed that consumption intensity is the highest in all irrigation methods at booting stage,Water consumption in all stages of paddy rice under no water layer irrigation,wet and dry cultivation and dry cultivation was respectively reduced 42.5%,51.3% and 57.6% than that under continuous flooding irrigation;and the rate of transpiration evaporation and seepage was 60.1%,16.4%,23.5%,respectively;water use efficiency of wet and dry cultivation was 1.6 kg/m3,photosynthetic rate and harvest index were the highest,It showed that wet and dry cultivation was the best method of paddy from saving water and productive efficiency.