Study On Water And Fertilizer Utilization Of Winter Wheat-Summer Maize Under Subsurface Drip Irrigation

Winter wheat-summer corn rotation is the main planting method of grain crop production in Shandong Province.Subsurface drip irrigation is an effective means to solve the efficient utilization of water and nutrients at the same time,which is widely used in cash crop production.However,in winter wheat-summer corn rotation production,there is a lack of in-depth research on the utilization of water and fertilizer under this irrigation condition.Effects of underground drip irrigation on water and fertilizer utilization of winter wheat-summer corn.A field experiment of 1-season winter wheat-summer corn rotation with underground drip irrigation was conducted in Zhangqiu District,Jinan City,Shandong Province.Dynamic changes of soil water and nitrogen,physiological indexes of crop growth and appropriate irrigation quota of crops were studied under different water and fertilizer configuration.The HYDRUS-2D model was constructed to simulate and study the soil water transport under different irrigation amounts.The main research contents and results are as follows:(1)Study on the influence of water and fertilizer allocation on soil water and nitrogen under subsurface drip irrigation.The experiment of winter wheat-summer corn underground drip irrigation was carried out in the experimental area,and different water and fertilizer allocation schemes were set up to study the effects of each scheme on the dynamic changes of soil moisture and nitrogen in 0-100 cm soil layer.(2)Effects of water and fertilizer allocation on growth physiology and water use efficiency of winter wheat-summer maize under subsurface drip irrigation.The plant height,leaf area,yield,chlorophyll content,photosynthetic characteristics and water use efficiency of winter wheat and summer maize were measured and calculated.Study the influence of different water and fertilizer allocation schemes on each index.(3)Construction,simulation and analysis of soil water transport model under subsurface drip irrigation.A soil water migration model was built to simulate the change of soil water content under primary irrigation.By setting different irrigation situations,soil water content under different irrigation amounts was obtained.By calculating the threshold of soil water content,irrigation water quota under primary irrigation was obtained by comparison.(4)Study on suitable irrigation strategy of winter wheat and summer maize under underground drip irrigation.Irrigation quota and water consumption were obtained by linear regression analysis of irrigation quantity and water consumption of winter wheatsummer corn and standardized water use efficiency and yield linearity respectively.It was concluded that W2～W3 irrigation scheme and F2 fertilization scheme were used for winter wheat.The W1～W2 irrigation scheme and F2 fertilization scheme can give consideration to the higher yield and water and nitrogen use efficiency of summer maize.