Study On Mulch Drip Irrigation Systems Of Corn In The Western Region Of Jilin Province

In this paper,based on specific natural climatic conditions,soil conditions and the physiological water law of corn in the western region of Jilin,carried out in accordance with corn mulch Drip Irrigation field trials test in the Zhanyu town of Jilin Tongyu County in 2013,study on Different irrigation(A:750m3/ha?B:960m3/ha?C:1170m3/ha)quota on maize water consumption and production,on corn growth period,Establish the actual local conditions suitable for optimization of irrigation system?Comprehensive analysis of the film or not yield benefits in several areas,soil salinization,environmental pollution,etc..The main findings are as follows:1.To solve the water consumption of corn Drip Irrigation under three irrigation quota for each growth period,the study results maize growth period Drip Irrigation water law,roughly trends were as follows:less than normal water consumption early,medium and more little late.And the total water consumption of maize growth period with the increase in irrigation quota increases,followed by C>B>A.2.The modulus of corn in water demand for each growth period Drip Irrigation irrigation quota is unlikely,filling stage are the largest period,the average reached 23.62%,the minimum maturity,the average is only 5.91%.Water demand strength from a seedling-filling period showed increasing trend,reaching a maximum average grain reached 6.22mm/d in the filling stage;milky stage harvest intensity gradually reduce water consumption.Meanwhile,the irrigation water on water use efficiency of corn is not obvious,but the impact of irrigation water productivity significantly.3.Through the growth period of drought single test data,for Jensen,Minhas,Blank.Stewart,Singh five water production function model is solved,Jensen model test to determine the optimum water production function model,derived jointing,tasseling stage,moisture-sensitive milky stage of grain filling stage and refers coefficients were:0.181,0.539,0.658,0.168.Also,make sure the tasseling and grain filling stage of maize Drip Irrigation water demand critical period.4.Based on the results of corn on water production function,using dynamicprogramming method to establish a local corn Drip Irrigation dynamic programming under deficit irrigation mathematical optimization model.Solved using VB6.0 programming language to determine the optimal allocation of different irrigation quota amount of corn each growth stage,that determines the testing ground corn irrigation drip irrigation system optimization..5.The use of film or not comparative test data on the effectiveness of two modes comprehensive analysis of various aspects.Drip Irrigation Water Consumption Law corn growth period film with no drip roughly the same,and the total water than non-film Drip Irrigation Drip decrease of approximately 11.20%;Drip Irrigation average single spike dry weight,grain weight and yield per hectare respectively.no film is higher than the 5.60%drip,6.81%,6.78%;corn drip Irrigation water use efficiency,irrigation water productivity,precipitation use efficiency were higher than corn no film drip irrigation,higher than 18.5 percent,respectively,6.74%,6.78%,and water use efficiency of drip irrigation are two modes are as follows:irrigation water productivity>precipitation use efficiency>water use efficiency.6.From corn seedling to maturity,the soil profile in the vertical direction,each of Drip Irrigation within 0?40cm soil salt content increased,from top to bottom in order to increase approximately 0.26mg,0.36mg,0.68mg.0.47mg,growth rate of about 7.85 percent salt,10.50%,21.93%,13.87%,of which 20?30cm soil salinity increased the most,while 40?50cm soil salinity decreasing trend,reducing 0.19mg,desalination rate of approximately 5.33%;no film drip all the 0?40cm soil salinity increased sequentially from top to bottom about 0.59mg,0.89mg,0.80mg,0.55mg,growth rate is about 16.67%salt,26.05%,23.98%,16.78%,of which 10?20cm maximum salt content increases,while 40?50cm soil salinity decreasing trend,reducing 0.24mg,desalination rate of about 6.23 percent.Meanwhile,due to the impact film role,Drip Irrigation evaporation smaller with each soil salinity water evaporation smaller extent vertically upward migration and subsequent soil salinity milky stage within 0?40cm soil depth volume or less;without film showed a drip soil salinity is a layered structure,and because no mulching,causing intense evaporation of soil moisture,salt to the surface of the deep,forming a salt accumulation in 0?30cm soil layer areas.Therefore,drip irrigation under more favorable crop growth and soil salinization control.7.The yield per hectare than corn Drip Irrigation yield no more than 900 pounds of film,but Drip Irrigation technology to reduce water consumption and increase corn production,but also brought a film contamination.So should increase research and recovery efforts mulch,mulch to improve the recovery rate to minimize environmental pollution caused by plastic film,in order to facilitate sustainable agriculture and ecological environment yield a virtuous circle.