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

In order to study the influence of different straw mulching modes and surface tillage adjustment measures on environmental regulation of root zone of the northeast black soil, field experiments were conducted under five tillage practices of surface tillage with straw mulching (STS), notillage with straw mulching (NTR)，surface tillage with straw mulching and compaction (SCTS), notillage with straw mulching and compaction (NCTR) and conventional tillage (contrast TC) for analyzing time and space dynamic change of soil moisture, heat, nutrient and physical properties by straw mode and surface tillage measures. The results showed that: straw mulching with surface tillage could improve soil physical structure on seeding stage and harvest stage, the soil bulk density of 0~50cm soil layer was reduced from 1.32% to 4.06% and 0.81% to 1.64%,the soil organic matter and available nutrients of 0~30cm soil layer were increased from 4.89% to 20.74%,1.94% to 40.37%,7.18% to 30.26% and 1.22% to 28.09%,，the soil moisture of 0~70cm soil layer was increased from 6.83% to 1384%,，the daily soil temperature difference at seeding stage of 0~10cm soil layer was reduced from 0.5℃ to 2.8℃ than that of comparison TC, so the effect of surface soil layer was higher than that of the bottom layer. Under the experimental condition, SCTS has advantages on regulation soil environment of root zone for high efficient and sustainable comprehensive evaluation. Research results provide reference basis for promoting implementation of covering cultivation measures on the northeast black earth area.