Study On Corn In Hetao Irrigation System Based On AquaCrop Model

Through the study of crop growth model and optimization of production condition, irrigation system and agricultural water management is an important content. This paper by 2015 in Hetao Irrigation District in Shahaoqu Experimental Station in spring corn field test data as the basis, of AquaCrop model calibration was performed, and the model verification and validation of Hetao Irrigation District irrigation of spring maize system was studied by, and the following conclusions are obtained:(1) Spring maize after emergence, the height of plant were in jointing stage of rapid growth, the growth rate slowed down to trumpet stage, until tasseling stage reached maximum value and remain unchanged. Whether in the jointing stage of irrigation on plant growth significantly, so the jointing stage was the effect of water stress sensitive growth stage. Leaf area index increased in the early growth period, the maximum value in the tasseling stage reached to leaf senescence and decreased. By the effect of water stress, leaf area index increased with the increase of irrigation water. Biomass in the early stage of growth increased rapidly with the increase of canopy, to the late growth stage, the growth rate was decreased, and the amount of irrigation was increased with the increase of the amount of irrigation.(2) By using AquaCrop model, the changes of canopy growth, soil moisture content, biomass and yield of Spring Maize during the growth period could be simulated accurately. Canopy coverage measured value and simulation value between the coefficient of determination than 0.97, the good fitting degree, are root mean square error between the 6.6%-8.3%; soil containing water measured value and simulated value between the determination coefficient of 0.55, more fitting, are root mean square error between the 1.6%-2.1%; biomass and yield of measured values and simulated values with a relative error less than 5.4%. The model simulation results are satisfactory and can be studied optimization of irrigation system of spring maize development model.(3) Combining shahaoqu experimental station annual runoff, and consider the spring maize growth and development rules, making 16 kinds of irrigation system scenarios, using calibrated AquaCrop model was used to simulate the irrigation regime of spring maize under different scenarios, to water use efficiency, yield high, such as, in the view of sustainable development is recommended in Hetao Irrigation District of spring maize irrigation system, namely in the jointing stage, bell stage and heading stage was used to irrigate 70mm,60mm and 75mm, irrigation quota for 205mm. Compared with the current irrigation condition, the irrigation quota of 290mm was reduced by 29%, while the yield was reduced by 12%, which achieved the purpose of water saving irrigation.