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

As the world’s most widely grown cereal crop, corn can be used as food, animal feed and industrial raw materials. Mechanized harvest of maize is an important link in maize production. Traditional artificial harvest requires a lot of manpower, material resources and time, and the corn harvest process is heavy, labor intensity is big, and harvest efficiency is low. In China, the phenomenon of rushing to harvest corn is common in the areas where the corn is harvested twice a year or more a year, so as to ensure the timely harvest of corn and the timely sowing of wheat, which is of great significance to realize the double harvest of corn and wheat production. With the accelerated development of maize industry, its mechanized harvest becomes more and more important. Corn mechanized harvest technology is one of the important ways to change the development mode of corn industry, improve the quality and efficiency, and enhance the competitiveness of the international market. At present, corn harvesting is in a key stage of transformation from mechanized ear harvesting to direct grain harvesting and transformation and upgrading of harvesting equipment. The research status and development trend of harvest technology and equipment at home and abroad were analyzed from two aspects of mechanized ear harvest and mechanized seed direct harvest, and the research progress of intelligent mechanical harvest technology such as automatic row and height automatic adjustment of cutting table, yield and moisture detection technology and automatic control of threshing parameters were analyzed. The standardization and mechanization testing methods and technical means were put forward, both to different requirements of high performance, high efficiency, high reliability model of agricultural equipment, enhance the level of intelligent equipment development train of thought, in order to promote China’s corn harvest mechanization technology progress and equipment upgrade to provide the reference.