WATER AND FERTILIZER COUPLING ON SOIL WATER DYNAMICS AND YIELD IN INTERCROPPED WHEAT AND MAIZE

Effects of water and fertilizer coupling on yield of intercropped wheat and maize and soil water dynamics were studied by the experiments with 3414 optimal regression design.Results indicated that significant difference was found in the yields under different model of water and fertilizer coupling.The yield and water use efficiency(WUE) were highest under 4800m3/hm2irrigation,420kg/hm2 nitrogen and 120kg/hm2phosphorus levels.Nitrogen is the first main yield factor with the second of irrigation water,and their absolute contribution rates are 80% and 53%,respectively.Significantly positive correlation was found between total yield and WUE(r=0.91**).Under the same level of irrigation water,lower nitrogenous fertilizer treatment increased soil water content of wheat zone compared with higher nitrogenous fertilizer treatment in the soil layer of 0 to 60cm during wheat flagging stage,while no significant difference was observed in maize zone in different condition of nitrogenous fertilizer treatment.However,after wheat were harvested,the soil water content of maize zone was significantly affected by the amount of N fertilizer,and the average soil water content showed N0 N1 N2 N3 in the soil layer of 0 to 80cm.