Exprimenl Of The Soybean Sprinking Irrigation Schedule And Optimization Of ISAREG Model In The Eastern Of Inner Mongolia

The main research content of this thesis is the optimal irrigation system of soybean under sprinkler irrigation condition at Arong banner Hulun Buir city Inner Mongolia.The specific location of test area is located in Liujiazi village Yadong town Arong banner.In the test,two different sprinkler irrigational methods of fixed and central shaft are adopted.In the research of Dengke No.1 soybean which is general used by farmers,we conclude the influence of soil water ratio,low temperature change,water consumption during growth period,intensity of water consumption,modulus of water consumption,efficiency of wather utilization, efficiency of irrigational water utilization,growing index,and yield. And we confirm the coefficient of soybean crop in different water year.On the foundation of evaluating actual irrigational systm with ISARREG model we simulate optimal irrigational systm in different water year. And draw the conclusions as follow:(1) According to actual situation of test area,wate and soil temperature are both important constraints of soybean’s growth during its seedling period.Under the local special meteorological condition of test area,if water ratio is relatively high while seeding,irrigation is better controlled after anti frost period before the appearance of serious drought. And if the soil moisture content is worse,irrigation better proceed in advance.(2)During growth and development of soybean(seeding～branching period)water consumption is relatively small.Reaching midterm of growth and development(blooming period-seed filling period) water consumpyion increases constantly.Entering into later period(seed filling period-ripe period) water consumption decreases constantly. From the general view,soybean’ sensitive peridos of water requirement are blooming period,pod bearing period,and seed filling period,and the critical period is pod bearing period,During the whole growth period of soybean,the general manifestation of water consumption is lesser at first and the trend is then increases and decreases again.(3) The intensity of daily soybean’s water consumption under sprinkler irrigation is pod bearing period> blooming period> seed filling period> branching period> seedling period> seed emergent period> ripe period.(4) According to comprehensive analysis of soybean’s plant height,stemdiameter,leaf area index,and dry matter accumulation under different irrigation during growth and development,and the analysis of relativity between yield and growth index,it can be confirmed that soy bean’s blooming and pod bearing period are the critical period of water requirement during local soybean’s growth and development.(5) According to the simulation of ISAREG in 2014 (low flow year P= 90.06) on soil moisture content of sprinkling irrigation soybean under diferent water management,when designed irrigation quota is 45mm,the comprehensive performance is that soybean is bigger during seedling,branching,and seed filling period,and smaller during blooming and pod bearing period,which is because of the different water consumption and designed wetted depth.It can also provide the basis for irrigational system in different year.(6) According to local actual situation, the optimal irrigational system of local sprinkling irrigational soybean in different year is concluded through comprehensive analysis of comparison between actual measurement irrigational systems,and comparison between designed model projects of various irrigational systems.