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

To find out the effect of cultivation methods on vegetable root, the lettuce root length, root depth and root width radius were studied in four cultivation substrates under drip and micro-sprinkler irrigation. The result indicated that root characters of lettuce cultivated in different substrates were no significantly different at 0.05 among different irrigation methods. Based on the experimental data of lettuce root, the simulation models for lettuce root length and root depth were established using the scale of effective cumulative temperatures (DD). The root depth in different layers and DD were used as the dependent variables to establish the root width radius model. The repeat test data were employed to verify the establishing models. The root mean square error and relative error between simulated and observed values were only 290cm, 0.81cm, 0.63cm and 15%, 12%, 13% for lettuce root length, root depth and root width radius under drip irrigation and micro-sprinkler irrigation.