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

A gate-type spray system was introduced for better control of insect pest in the corn crop grown mid latterly, due to the problem caused by coverage limitation of high-frame corn sprayer and low efficiency of hand operating knapsack sprayer. The new sprayer combined suspender spray device and horizontal spray boom, and was suitable to high-frame row span and self-propelled sprayer of the corn zone in northeast China. The structural and performance parameters of the system derived by theory and experiment methods were as follows: the spray angle of top nozzle and branch nozzle were 80° and 110° respectively, the angle between the “Y” branch boom and the vertical boom was 20°, the length of the boom was 1200 mm, the spray scale of the gate-type spray system in the vertical plane was 1150 mm. For analyzing the deposition characteristics of the gate-type spray system, a contrast test with the conventional boom sprayer was carried out on the test bed. Compared with the latter, the advantages of the gate type spray system were shown as follows: the unit area droplets deposited amount(UADDA) on the front surface of the leaves located on upper-middle positions was 12.5% higher than the latter, while the spray volume was the same. The UADDA on the back side of the leaves located middle position and the two sides of the leaves of the lower positions were significantly increased by using the suspender spray device. The combination of suspender and horizontal boom resulted in better deposition uniformity. 