【摘要】 在水稻拔节孕穗和抽穗开花期,分别以土壤饱和含水率的70%、80%和90%作为灌溉下限进行控制灌溉。结果表明,与常规灌溉相比,拔节孕穗期水分控制条件下水稻生长受到抑制,单穴有效穗数和千粒质量变化较小,每穗粒数和每穗实粒数显著减少,产量也有减小趋势,但差异不显著;抽穗开花期控制灌溉对水稻生长和产量影响相对较小,均未达到显著水平;拔节孕穗期控制灌溉较抽穗开花期节水效应明显,但抽穗开花期控制灌溉有利于获得更高的水分生产效率,因此,制定水稻控灌灌溉制度时,拔节孕穗期轻控,抽穗开花期适当增大水分控制下限有利于水稻节水增产。更多还原

【Abstract】 In order to apply the controlled irrigation technique for rice more reasonably,the effect of controlled irrigation in a single growing stage on rice growth and yield was studied.Water control was launched in jointing-booting stage and flowering stage respectively,and in each stage,three lower limit of soil water content(70%,80%,and 90%,respectively) was controlled.The results showed that compared to check treatment,water control at jointing-booting stage did not apparently change effective panicle number per hole and 1000-grain weight;grains per panicle and filled grain number per panicle decreased significantly while yield had a slightly decreasing tendency;water control at flowering stage had little effect on rice growth and yield,changes of physiological indexes were insignificant.Controlled irrigation applied at jointing-booting stage saved more irrigation than that conducted at flowering stage,but controlled irrigation at flowering stage could get higher irrigation water use efficiency.Therefore,small control at jointing-booting stage and big control at flowering stage would be beneficial to water saving and increasing yield.更多还原