ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

Over the course of one summer maize and winter wheat rotation cycle, three irrigation treatments (ground water with a quota of 52.5mm; reclaimed water with a quota of 52.5mm; reclaimed water with a quota of 105mm) were set up, and in each treatment, the soluble K+, Ca2+, Cl- and the electric conductivity (EC) leaching and migration in 0~450cm soil were studied. The results showed that the soil salinity content and EC value were in the following descending order: 380~450cm loam soil layer, 0~120cm loam soil layer, and 120~380cm sandy soil layer. Soluble K+ and Cl- in reclaimed water had a strong leaching and migration ability, and reached the 450cm depth, and the influences of reclaimed water irrigation on soluble K+ and Cl- changes were mainly in 0~450cm soil layer and 0~250cm soil layer, respectively. Soluble Ca2+ and EC reached the 380cm depth, but the influences of reclaimed water irrigation on soluble Ca2+ and EC changes were mainly in 0~120cm soil layer. The 380~450cm soil layer played a role as a block layer for soil salinity leaching, and decreased the pollution risk of soil salinity ion to groundwater. It suggested that irrigation with reclaimed water with a quota of 52.5mm, while irrigation 1 time and 4 times or less during the summer maize and winter wheat growing seasons, respectively.