我所在夏玉米单产500公斤栽培技术研究的基础上,1981～1985年,采用紧凑型品种掖单二号、烟单14、郑单八号等杂交种,培植高产块和辅助试验,探讨夏玉米单产600～650公斤以上的群体生理指标和相应的栽培技术。五年来,示范面积438亩,单产都在600公斤以上,最高单产653公斤,基本摸清了夏玉米高产栽培的群体生理指标及其配 Based on the research on 500 kg cultivation techniques of summer maize per unit area, from 1981 to 1985, the hybrid varieties Yedan No.2, Yudan 14 and Zhengdan No.8 were used to cultivate high-yielding maize and auxiliary experiments to explore the effects of summer maize Yield of more than 600 to 650 kg group of physiological indicators and the corresponding cultivation techniques. Over the past five years, the demonstration area of ​​438 acres and yields of 600 kilograms or more, the highest yield of 653 kilograms, basic find out the summer maize high-yielding population physiological indicators and their distribution