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我们从1983年开始采用玉米免中耕技术,多采用播后苗前施药。在施药作业中经常遇3级以上春风,影响施药作业顺利进行,因而拖延了作业期,耽误了农时。此时又正是春播和几项机耕作业同时进行的大忙季节,争机车、争劳力的矛盾很突出,所以免中耕效果不很理想。自1986年开始,我们搞了大面积播前施药免中耕机械化栽培,取得了很好的效果。具体做法是:在秋季,用链式拖拉机牵引四铧犁、41片圆盘耙,将地块翻耙一遍,耕深要达到18—20厘米,耙地必须达到耙平、耙碎、耙到,春季再耙播一次,达到能进行精量播种的要求。
Since 1983, we have adopted corn-free cultivation techniques, and more use of seedlings after sowing before spraying. In the application of pesticide often encounter three or more spring breeze, affecting the smooth operation of pesticide application, which delayed the operation period, delayed agricultural time. At this point, it is also a busy season in which spring sowing and several tilling operations are carried out at the same time. The contradiction between locomotives and fighting over labor is prominent. Therefore, the effect of avoiding tillage is not very satisfactory. Since 1986, we have conducted a large area pre-planting pesticide cultivation without cultivation, and achieved good results. The specific approach is: in the fall, with a chain tractor traction four plow, 41 disc harrow, turn the land rake again, to deep plowing 18-20 cm, rake must reach rake flat, rake broken, rake , Then rake again in spring, to achieve the precision sowing requirements.