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昌图县栽培的玉米杂交种,一般亩保苗3,000～3,500株,一些高产社队密度更高些。但是,中单2号引种几年来,在这样的密度下,表现不好。 据我们1980～1981两年试验,丹玉6号的最高产量出现在亩保苗3,200～3,700株的密度。而中单2号的很高产量,则出现在亩保苗2,500株。如密到亩保苗3,000株时,产量略有下降,超过3,500株时产量明显下降,达到4,000株时,不论施肥多少,亩产量最高也只能达
Changtu County cultivated corn hybrids, the general Miao Bao 3,000 to 3,500 strains, some high-density confederation team higher. However, Zhongdan 2 introduced several years ago, at such a density, the performance is not good. According to our two experiments from 1980 to 1981, the highest yield of Danyu 6 appeared in the density of 3,200 ~ 3,700 mu of seedlings per mu. However, the high yield of No. 2 in Zhongdan appears in 2,500 mu of seedlings. For example, when there were 3,000 plants in Mubao Miao, the yield decreased slightly. When the number exceeded 3,500, the yield dropped obviously. When the number reached 4,000, no matter how much fertilization, the highest yield per mu could only reach