北方种谷素有“踩仰脸格子”习惯,就是当谷苗刚一露出地表进行人工多次踩压,使土粒间紧密衔接,以利谷子幼根生长。也有在苗期(指拔节期以前)进行镇压的,但效果如何尚无报导。为此,我们黑龙江省牡丹江地区农科所进行苗期不同叶龄(3叶、5叶、7叶和9叶)压青试验,其结果如下: Northern Hedysarum has a “step on the checkered face” habit, that is, when the Miao Miao has just exposed the surface of the artificial multi-step on the pressure so that soil particles closely linked to facilitate the growth of young roots of millet. There are also in the seedling stage (before the jointing period) to suppress, but how the effect has not been reported. To this end, we Mudanjiang Prefecture, Heilongjiang Province Agricultural Sciences seedling stage of different leaf age (3 leaves, 5 leaves, 7 leaves and 9 leaves) green pressure test, the results are as follows: