河北龙关县郭庄子志勇农业社,在1954年创造了一种作物播种后(幼苗未出土前)遇雨土表结壳的破除方法。特介绍如下:材料是用普通镇压用的砘子,和4—5尺长的铁蒺藜丝两条(铁蒺藜丝愈密愈好)。使用时把铁蒺藜丝在砘子上紧缠3—5圈,就可以和砘地一样很好的利 Longgang County, Hebei Guozhuang Zi Zhiyong Agricultural Society, in 1954 to create a crop sowing (before the seedlings were not unearthed) case of rain and surface crust crush method. Special introduction is as follows: The material is used for ordinary repression of prickly heat, and 4-5 feet of iron wire Chenopodia two (the more the better wire). When used to tie the iron Chenopodium wire in the razor tight wrapped around 3-5 laps, and can be as good as