不同密度下玉米雌雄穗开花间隔与产量关系研究

以70年代以来我国大面积推广的杂交种为材料,在15 000(低)、45 000(中)、75 000(高)株/hm2密度下,研究不同密度对不同年代杂交种雌雄穗开花期间隔(ASI)、产量及相关性状的影响。结果表明,随着密度增加,ASI与产量关系更趋密切。高密度下,ASI与产量显著正相关;中、高密度下不同年代品种间ASI差异显著,且高密度下ASI、产量与年代呈显著直线回归关系。随密度增加,新品种ASI增加变化率减小,但产量增加变化率较大。ASI值可作为品种耐密性鉴定的重要参考指标,不同密度下新品种ASI更趋稳定,耐密性增强。

Study on Relationship Between Anthesis-silking Interval of Maize in Different Densities and Yield

A time series of hybrids(1970 - 2000) released widely on their years were grown in three densities of 15 000(low), 45 000(intermediate) and 75 000(high) plants/ha . It studied the effects of different densities on ASI, yield and related traits. The result suggested that there was close relation between ASI and yield with the density increased, and that had a significant positive correlation in the high density. The difference of ASI among different years was significant. Regression of ASI or yield was significant with years releasing. The change rate of ASI showed a small trend, but the change rate of yield increased with densities increasing. The value of ASI should be used as an index to checking up resistance to high densities. Newer hybrids of ASI kept more stable and were more resistance to high density than that of older hybrids in different densities.