江西水稻需水规律和灌溉用水变化规律分析

Analysis of Rice Water Requirement Rule and Irrigation Water Utilization Variation in Jiangxi

分析了近30年来江西水稻参考作物蒸发蒸腾量和蒸发蒸腾量的资料,总结了近30年来江西水稻需水量变化规律,计算了作物需水系数,并分析作物需水系数年际和年内变化规律;同时,根据水稻蒸发蒸腾量、作物需水系数和有效降雨量等因素,计算了水稻灌溉用水定额,分析水稻灌溉用水定额近年来变化规律,指出应加强水稻适宜灌溉制度、耕作制度和土壤改良技术的研究和推广。

According to the evapotranspiration data of rice reference crop in the past 30 years in Jiangxi and the statistical analyses of them,this article summarized the variation rule of water requirement for rice in recent 30 years,calculated the water requirement index of crop,and analyzed the annual,seasonal and monthly changes in water requirement index of crop.On the basis of some factors such as evapotranspiration of rice,water requirement index of crop and effective precipitation,the author calculated the quota of irrigation water used for rice,analyzed the irrigation water variation of rice in recent years,and pointed out that we should strengthen the study and popularization of rice suitable irrigation rule,as well as the system of cultivation and soil improvement technology.