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 alleviate freshwater shortage in salinization area, use the saline water more scientifically and rationality, and improve the yield of alfalfa, taking Zhongmu No.1 as the materials and freshwater (mineralization degree of 1 g/L) as contrast, the experiments were conducted to learn the effect of saline water (mineralization degree of 3 g/L, 5 g/L and 7 g/L) on germination percentage and plant height of alfalfa. The results showed that the germination percentage and plant height had no significant difference between 3 g/L and fresh water, but it showed great difference when the mineralization degree raised to 5 g/L and 7g/L. The results indicated that, in order to ensure the germination percentage more than 80%, the mineralization degree should be controlled to less than 4.48 g/L. When the satisfied plant height was attained, the mineralization degree should less than 4.66 g/L, otherwise, the growth of alfalfa would be inhabited by long-term salt stress.