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晋西黄土丘陵沟壑区,地广人稀,三料俱缺,土壤瘠薄,农业产量低而不稳。特别是占耕地面积百分之二十左右的坡地麦田,当地农民多年来习惯于夏季休闲。由于夏闲期正是降雨集中季节(7—9月),麦茬地失去植被,地面裸露,水土流失十分严重,加之肥料缺乏,土壤肥力逐年下降,耕层土壤有机质含量仅0.3%左右,全氮含量0.025—
The western Shanxi hilly and gully region, sparsely populated, lack of material, soil infertility, low and unstable agricultural output. In particular, on the sloping fields of wheat fields, which occupy about 20 percent of the arable land, local peasants have been accustomed to summer recreation for many years. As the summer fallow period is the rainy season (July-September), the stubble fields lose vegetation and the ground is exposed. The soil erosion is very serious. In addition, due to the lack of fertilizers, soil fertility decreases year by year. The content of organic matter in tillage soil is only about 0.3% Content of 0.025-