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笔者近几年在黄淮流域进行田间调查时观察到,机收玉米后茬的冬小麦田有大量玉米苗发生,表现为群体密度大、生长势强、覆盖度高,与麦苗争夺水分、养料、空间,造成冬小麦苗期生长势弱,抗逆性差,并降低有效分蘖和安全越冬,这些均已影响小麦正常生长,应引起关注和重视。1.不可避免又应重视的生产措施上述情况涉及玉米和冬小麦两种作物的轮作,是黄淮流域比较普遍的一种生产模式,具代表性。随着农业机械化程度和耕作制度的改革提高,一次性收割玉米脱粒并碎秆还田,再经旋耕机
In recent years, the author conducted field surveys in the Huanghe-Huaihe River Basin. It was observed that a large number of corn seedlings occurred in the winter wheat fields after harvesting maize. The results showed that the population density was high, the growth potential was strong, the coverage was high, and the wheat seedlings competed for water, nutrients, Space, resulting in the growth of winter wheat seedling weak, poor resistance, and reduce the effective tillering and safe winter, which have affected the normal growth of wheat, should cause for concern and attention. 1. Inevitable and Emphasis Production Measures The above situation involves the rotation of two crops, corn and winter wheat. It is a relatively common mode of production in the Huang-Huai basin and is representative. With the degree of agricultural mechanization and farming system reform and improvement, one-time harvest of corn threshing and straw returning, and then rotary cultivator