Soil Water-salt Dynamic And Oasis Cotton Response To Irrigation Under Different Levels Of Plastic Film

Plastic film pollution has posed a serious threat to the sustainable development of agriculture, changes in agricultural mulch residue soil or soil pore continuity cutting, the influence of gravity to move the water, reduce the ability of sustainable development of cultivated land. "With salt water action", while plastic film hinder moisture migration barrier salt movement, so the amount of irrigation and the residual amount of salt in cotton interaction mechanism for revealing residual, to identify the measures and mechanism of efficient water use in cotton fields under different plastic film pollution levels. Reasonable regulation of irrigation, reduce soil salinization, soil improve environmental quality, and governance in cotton farmland mulch residual contamination provide a theoretical basis. 1. The variation of water and water consumption under different irrigation levels and plastic filmDifferent plastic film processing volume growth period water was no significant difference. After the end of irrigation, conventional irrigation under plastic film soil moisture increase was significantly lower than the amount of processing. Plastic film soil moisture variation reduction process under irrigation was significantly higher than the control, incremental irrigation treatments indifference soil moisture variation. Conventional irrigation reduction, no residual film treatment wash salt treatment was significantly higher than plastic film, plastic film processing wash salt rate higher incremental irrigation. 2. The temporal distribution of soil moisture under different irrigation levels and plastic filmReduction of conventional irrigation and irrigation plastic film soil moisture is higher than the control, irrigation under plastic film processing incremental soil moisture content lower than the control. Time: under normal irrigation moisture decreased soil moisture at most, and incremental reductions irrigation fell more plastic film processing. Vertically: conventional irrigation, soil moisture content no residual film rate with the deepening of soil depth increases, the plastic film processing different laws, irrigation and incremental reductions under irrigation, 0 ~ 40 cm soil layer moisture trend is not obvious. Horizontally: reduction under normal irrigation and irrigation, plastic film to hinder the water in the horizontal direction is stronger, incremental irrigation, plastic film on the horizontal soil moisture change is not obvious. 3. The temporal distribution of soil salinity under different irrigation levels and plastic filmConventional irrigation volume and reduction of irrigation, plastic film processing 0 ~ 40 cm soil layer above the soil salinity control; incremental irrigation control soil salinity is higher than the plastic film processing. Time: regular irrigation and irrigation reduction after 1 to 5 days under irrigation control soil salinity fell more, soil salinity irrigation under plastic film processing incremental decline more. Vertically: the processing of each soil salinity distribution is more uniform in the vertical direction. Horizontally: the amount of conventional irrigation and irrigation under plastic film on the reduction in the horizontal direction on salt leaching obvious. 4. Effects on yield and WUE of cotton under different irrigation levels and plastic filmConventional irrigation reduction a low production of plastic film; irrigation under plastic film processing incremental a slightly higher yield, increase in the amount of irrigation can reduce the impact of plastic film for cotton, but each treatment yields are lower. Plastic film processing conventional cotton field WUE under irrigation and irrigation reductions were significantly lower than non-treated plastic film, plastic film processing incremental irrigated cotton field WUE slightly higher than non-treated plastic film, plastic film can be increased by improving irrigation cotton field WUE, but the increment cotton fields under irrigation WUE was significantly lower than other irrigation treatments.