麦田生态系统中的水肥时空关系与调控途径

本研究表明，小麦对水分的消耗和养分的吸收不是同表的；拔节--抽穗期是小麦对水分最敏感的时期，该期的水分状况对产量和肥效的影响最大，返青--拔节期是对水分最不敏感的时期。麦田灌水量直接影响肥料氮在土体中的淋洗深度，进而影响到其肥效的发挥与损失量，因而控制灌水量是减少水源浪费与肥料损失、提高肥效的重途径。并提出了以冬施肥为核心的缺水麦田水肥调控途径。

Space-time Relations of Water and Nutrients in Wheat Field and Ways for Their Management

Studies on the relations of water and nutrients showed that water consumption and nutrient absorption by winter wheat were not simultaneously.During elongation to earring,wheat is highly sensitive to water conditions,then water suply during this period will greatly affect the yield and nutrient effciency.During the growth period of turning green to elongation wheat is leastly sensitive to water suply.Irrigation directly affects the depth of N in fertilizer leached,furtherly affects the fertilizer efficiency and quantity lost. Therefore control of irrigation norm is an effective way in reducing fertilizer losing and irrigation water wasting,and increasing the efficiency of fertilizer.Based on water-nutrient relation,ways for management of irrigation and fertilizer in which winter irrigation as the main technique had been developed with good results in the initial practice.