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无论粘土或壤土,在降雨后地表都会结成一层硬壳,恃别是胶泥土更为严重。如正赶上播种后幼芽尚未出土时,幼芽即形成拗曲状态不能出土,以致造成缺苗现象。一般农民解除硬壳的办法是用楼或三齿钩来挑,这样很费事,效果也较差。雄县农民朱克检用刺猬砘子(如下图)来挑,省工、效果也较好。我们认为是值得研究改进或重点试用的。
Whether clay or loam, the surface will form a layer of hard shell after rainfall, depending on whether the clay soil is more serious. If you are caught sowing buds have not yet unearthed, the bud that is formed in the state of bend can not be unearthed, resulting in lack of seedling phenomenon. The general peasants to lift the hard shell approach is to use the three-hook or to pick, it is cumbersome, the effect is poor. Xiong County peasants Zhu Ke prosecution hedgehog prickly heat (as shown) to pick, labor, the effect is better. We think it is worthwhile to study improvement or key trial.