Effects Of Different Irrigation On Soil Water Balance And Crop Growth In Winter Wheat-Summer Maize Rotation System

The quantity of water per capita and land of Hebei province were respectively l/7 and l/9 to that average of China.Annual precipitation has been decreasing and evaporation has been increasing. The shortage of water resource has become the limiting factor of sustainable development of high-efficient agriculture in North China Plain.How to increase irrigation water use efficiency has become present research focus of agricultural water saving.So,the research chose Xinji as the testing field of winter wheat-summer maize rotation system in Hebei Plain, to study the effects of different irrigation on soil water dynamics and the response of crop,to analyse the difference between drought resistance variety of WUE and high yielding variety of that. The main results were as follows:1. Soil water storage of crop non-irrigated treatments was less than irrigation treatments. The difference of soil moisture content between irrigation treatments was litter. Soil moisture content of non-irrigated treatments was less than irrigation treatments in the 0~100 cm soil layer.The difference of soil moisture content among three treatments was great in the 40~80 cm soil layer.The water consumption per day of non-irrigated treatment decreased 46.88% and 76.94% than that of irrigated treatment.The least water consumption per day occurred between seeding and sprouting stage.Irrigation quantity and irrigating stage of corn influenced the soil moisture before sowing wheat. The soil moisture storage above 100 cm of irrigation one time and irrigation two times treatments added 50.05 mm and 68.04 mm than that of non-irrigated treatments. Irrigating during the late growth stage of corn, the soil moisture before sowing wheat increased. Soil water storage of crop non-irrigated treatments were less than irrigation one time treatments and irrigation two times treatments.The difference of soil moisture content among three treatments was great in the 40~80 cm soil layer.After irrigating,B treatments was higher than A treatments in the 0~100 cm soil layer. The least water consumption per day occurred between seeding and setting stage.After irrigating for the jointing stage, the water consumption per day of non-irrigated treatment decreased than that of irrigated treatment.2. Irrigation had less influence on the yield of Zhengdan 958 that was the drought resistance genotype.The yield of non-irrigated treatments decreased 8.02% than that of irrigated treatments, the WUE of non-irrigated treatments were higher than that of any other treatments. Compared with irrigation two times treatments, WUE of irrigation one time treatments were increased by 16.40%.With the depth of soil increasing, nutrient contents decreased in the 0~60 cm soil layer .The soil nutrient contents mainly concentrated in the 0~10 cm soil layer.3.The yield of B3 treatments of two varieties were the most. The yield of non-irrigated treatment and irrigated treatment under A treatments were significantly correlations.The yield of A treatment increased 10.79% than that of B treatment. Increasing the quantity water consumption,WUE of wheat decreased.The WUE of A treatment decreased 8.48% than that of B treatment.Compared with A treatments,WUE of B treatments were increased by 2.25 kg·mm-1·hm-2 and 2.10 kg·mm-1·hm-2. With the depth of soil increasing, nutrient contents decreased in the 0~60 cm soil layer .The soil nutrient contents mainly concentrated in the 0~10 cm soil layer.4.The annual product income of rrigation one time treatment and irrigation four times treatments were significantly correlations,two types of irrigation four times treatments were not significantly correlations. The irrigation water use benefit of irrigation one time treatment and irrigation four times treatments were significantly correlations,two types of irrigation four times treatments were not significantly correlations. The irrigation water use benefit of Ha+Ac treatments was the most.