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

Analyzing the interaction of straw-soil-machinery and clarifying the movement and distribution of straw plays an important role in straw management and optimal design of farming machinery. Design-Expert software and Box-Behnken test were used to conduct an experimental study on the performance of key operation parameters under the interaction of straw-soil-rotary tiller on straw displacement and burying effect. In the tillage experiment, a quadratic regression orthogonal experiment was designed with three factors and three levels, including the influencing factors of the straw length, the tillage depth, and the rotary speed, and the response indexes of straw displacement and burial rate. By establishing the response surface mathematical model, the effects of various factors on the performance of rotary tillage were analyzed. The experimental results showed that the significant order of the influence on the amount of straw burial rate and straw displacement was as follows: the tillage depth, the straw length, and the rotary speed. The interaction between the tillage depth and the straw length had a significant impact on the straw burial rate and straw displacement, while the interactions between other parameters were not significant. When the straw length was 5cm, the tillage depth was 14.99cm and the rotary speed was 320r/min, the straw returning effect was the best. The corresponding indexes of straw burial rate and straw displacement were 95.5% and 27.6cm, respectively. The optimized parameters were used for experimental verification. The straw burial rate and straw displacement were 93.3% and 28.1cm,respectively. The results can provide reference for the adjustment of operation parameters of rotary tillage and provide theoretical support for the study of straw-soil-machine interaction mechanism.