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以当地主栽的30个玉米品种为试验材料,设4个密度处理,在辽西地区进行增密试验。结果表明:所试品种的适宜密度比当地生产上的实际密度(37 500株/hm2,对照密度)高出20%～40%,多数品种比对照密度产量增产20%～30%,说明辽西地区玉米生产的密植潜力还很大。有11个品种的最高产量比郑单958和先玉335显著增产或与其相当,其中有8个品种增产幅度为5.9%～17.4%,高产品种的生物产量和经济系数也相对较高。增加密度后,株高对密度的响应因品种而异,在密度增加到45 000株/hm2或52 500株/hm2时株高明显增加,继续增加密度时株高不再增加的品种增产幅度大;株高随着密度增加而持续上升的品种增产的幅度明显下降;密度增加而株高不变的品种没有表现出较大的增密增产潜力。
In this study, 30 maize cultivars mainly cultivated in the region were used as experimental materials. Four density treatments were conducted and densification tests were conducted in western Liaoning. The results showed that the suitable density of the tested varieties was 20% -40% higher than the actual density (37 500 plants / hm2, control density) in the local production, and most varieties increased 20% ~ 30% Densification potential of corn production is still great. The highest yield of 11 cultivars was significantly increased or equivalent to that of Zhengdan 958 and Xiangyu 335, of which 8 cultivars increased by 5.9% ~ 17.4%, and the biological yield and economic coefficient of high yield cultivars were also relatively high. After increasing the density, the response of plant height to density varied with different varieties. When the density increased to 45 000 plants / hm2 or 52 500 plants / hm2, the plant height increased obviously. When the density continued to increase, the plant height no longer increased ; The increase of plant height with the increase of density significantly increased the rate of increase; the density increased while the plant height did not show a larger increase yield potential.