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.