河北省各农业机器拖拉机站在1956年秋多推行了播前镇压技术。为了解机械镇压在生产实践中的作用,我们于今年5月下旬6月上旬在肥乡、元氏、通县三个拖拉机站进行了该项作业对小麦增产效果的调查,兹将调查结果初步整理如下。一播前镇压对小麦增产的效果三个站五个对比点调查如表1,证明播前镇压肯 Hebei Province, the agricultural machinery tractor station in the autumn of 1956 to promote the pre-broadcast suppression technology. In order to understand the role of mechanical repression in production practice, we conducted a survey of the effect of this operation on the yield increase of wheat at the three tractor stations of Feixiang, Yuanshi and Tongxian in late May this year in early June. Finishing as follows. The effect of a pre-broadcast suppression on the yield of wheat Three stations of five contrast points as shown in Table 1, to prove pre-broadcast repression Ken