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1979—1982年在县农科所试验场等单位定点定株观察了套种玉米“京杂六号”生育进程,探讨了丰产栽培技术指标。观察结果:次生节根共九层,其中一至六层地下节根分别于
From 1979 to 1982, the fertilization process of intercropping maize “Jingza No.6” was observed in the experimental units of county agricultural science institutes and other units. The technical indexes of high yielding cultivation were discussed. Observations: There are nine secondary root nodes, of which one to six underground root segments are respectively located