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小麦玉米一年二作是黄淮海平原的主要粮食种植体系。该体系一直沿用一年中只在麦前机械耕翻一次的土壤耕作制度。但由于机耕的压迫和机耕较浅(15～20厘米),下层土壤过紧,多年来已形成不利作物扎根的犁底层,影响作物的生长发育,特别是对玉米这种根系较发达,对土壤空气要求较多的
The second year of wheat and corn is the main grain planting system of the Huang-Huai-Hai Plain. The system has been based on the soil tillage system that plowed machinery only once before the wheat harvest in one year. However, due to the plowing and shallow tillage (15-20 cm), the soil in the lower layer is too tight, and the plow has been formed for many years and has adverse effects on the growth and development of crops. In particular, the root system of maize is more developed, More air requirements