Study On Transport Of Soil Moisture And Heat And Yield Addition Of Corn Growing Using Drip Irrigation Under Film

At present, the proportion of industrial water and domestic water of our country is increasing every year, the shortage of agricultural water have become increasingly prominent. Developing water-saving agriculture and improving efficiency in using agricultural water is one of the main tasks in the coming period of agricultural development. As a product of the continuous development of water-saving irrigation agriculture, drip irrigation under film undoubtedly has a high efficiency, study on drip irrigation under film has important practical significance in the application of agricultural production.In this article, we choose Tongyu District in Jilin Province as research area, and corn as research crop, design drip irrigation whether covered by film and different irrigation quota as experimental variables. After experiment, we explored the variation laws of soil moisture and heat in different depth during corn growing period, analyzed the pros and cons of irrigation regime by yield and water productivity. Main conclusions are as follows:(1) Dividing 0-100cm depth into six sections and determining the soil moisture of drip irrigation under film and drip irrigation without film, analyzing the influence from three different irrigation quota (850m3/hm2,1060m3/hm2,1270m3/hm2).The results shows:Drip irrigation under film could significantly improve the soil moisture of different soil depth.(2)Determining the soil heat in the soil depth of 5cm、10cm、15cm、20cm、25cm and analyzing the daily variation during seeding stage of corn. The results shows:In contrast with drip irrigation without film, drip irrigation under film may increase the soil temperature about 2℃. Besides, soil temperature will decrease as irrigation quota increased.(3) Drip irrigation under film significantly increased corn height and leaf area index (LAI). Irrigation quota will increase plant height and leaf growth by affecting soil moisture content. The experimental sample plot with the largest irrigation quota has the largest ear length, ear girth, ear row number, grain number, grain weight, kernel weight.(4) The experimental sample plot with film has more economic yield and larger coefficient of economic than the experimental sample plot without film. The irrigation quota can enhance the yield and coefficient of economic, but it may be harmful to the yield if irrigation quota exceeds a certain range. So we should choose the most reasonable irrigation quota to guarantee the most yield and the largest water productivity during planting corn.