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 realize the nursing seedlings of super rice, a type of vacuum-vibrating tray precision seeding device was designed. The super rice Changyou 3 was selected, the effects of relative pressure, diameter of suction hole, vibration frequency of plate, amplitude, the suction distance on seeding performance was analyzed with a five-factors and four-level orthogonal experiment. A mathematical model was established between seeding device parameters and seeding performance index, which provided the basis for the parameters selection of the precision seeder device in seeding process. The multi objective optimization genetic algorithm was made and the optimal parameters were determined as: vacuum negative pressure value of 3.68kPa, diameter of suction hole of 1.84mm, vibration frequency of 10.90Hz, amplitude of 4.09mm, the suction distance of 3.92mm which were verified by experiments. Through seeding test of the long type super rice, the results were consistent with theoretical analysis, which showed that the seeding device had a good adaptability to different varieties of super rice, which were suitable for different varieties of super rice seeding. Through sowing and seedling test, the seeding device could meet requirements of super rice planting seedling.