AGROCLIMATIC CRITERIA OF WHEAT OPTIMAL IRRIGATION IN REGION OF BEIJING, TIANJIN, HEBEI, SHANDONG, HENAN

According to the analysis of water experimental data of winter wheat in Gong County and Taian City for 4 years optimal water consumption was defined.Each factors affecting water condition of wheat field were analyzed from points of making full use of natural precipitation and soil water storage, and water difference between supply and demand during whole growing season was obtained. Suitable irrigation times were defined according to difference of water consumption between different stages and dynamic analysis of wheat field water. For the above-mentioned results wheat optimal irrigation program in region of Beijing Tianjin Hebei Shandong Henan in normal climatic program year was given. Results of extend application in wide area indicated that the is feasible and has higher ecnomic benefit.