密植对百玉393的单株产量及相关农艺性状的影响

Effects of the planting density on the yield per plant and the agronomic traits of Baiyu 393

为研究密植对百玉393的单株产量及相关农艺性状的影响,试验设计6个密植条件,以穗长、秃尖长、穗粗、穗行数、行粒数和单株产量为对象进行调查研究.统计分析表明,随着种植密度的升高,百玉393的单株产量呈先减小后增大的趋势,在5500株/667 m^(2)条件下的单株产量最低.相关性分析表明,百玉393在不同密植条件下的单株产量与穗长、行粒数呈显著正相关;穗粗与穗长、行粒数均呈显著正相关;穗长与行粒数呈极显著正相关.方差分析表明,穗长和行粒数在各密度间的差异均显著,秃尖长、穗粗和穗行数在各密度间的差异均不显著.多重比较表明,种植密度在4000、4500株/667 m^(2)的穗长与其它密植条件下的穗长有显著差异,5000、5500株/667 m^(2)的穗长与6000、6500株/667 m^(2)的穗长有显著差异,其它密度下的穗长无显著差异;种植密度在4000、4500株/667 m^(2)下的穗粗与6500株/667 m^(2)的穗粗有显著差异,其它密植条件下的穗粗均无显著差异;种植密度在4000株/667 m^(2)的行粒数与5500、6000、6500株/667 m^(2)的行粒数有显著差异,4500株/667 m^(2)的行粒数与6000、6500株/667 m^(2)的行粒数有显著差异,其它密度下的行粒数均无显著差异;各密植条件下的秃尖长和穗行数均无显著差异.

To further understand the effect of planting density on the yield per plant and the related agronomic traits of Baiyu 393,six planting densities were designed,and the ear length(EL),the bald-tip length(BL),the ear diameter(ED),the ear row number(ERN),the kernel number per row(KNPR),and the yield per plant(YPP)were investigated in the field.Statistical analysis showed that the YPP of Baiyu 393 decreased first and then increased with the increase of planting density,and the YPP was the lowest under the planting density of 5500 plants/667 m^(2).Correlation analysis showed that the YPP of Baiyu 393 was significantly positively correlated with the EL and the KNPR under various densities,the ED was significantly positively correlated with EL and KNPR under various densities,and the EL was extremely significant positively correlated with KNPR under various densities.The analysis of variance showed that the EL and KNPR were significant different under various densities,while the differences of the BL,ED and KNPR were not significant under various densities.Multiple comparisons for EL showed that the EL of planting densities of 4000~4500 plants/667 m^(2) were significantly different from those of the other densities,the EL of 5000~5500 plants/667 m^(2) were significantly different from those of 6000~6500 plants/667 m^(2),and the EL was not significantly different under other densities.Multiple comparisons for ED showed that the ED of 4000~4500 plants/667 m^(2) were significantly different from that of 6500 plants/667 m^(2),and the ED was not significantly different under other densities.Multiple comparisons for KNPR showed that the KNPR of 4000 plants/667 m^(2) were significantly different from those of 5500,6000~6500 plants/667 m^(2),the KNPR of 4500 plants/667 m^(2) were significantly different from those of 6000~6500 plants/667 m^(2),and the KNPR was not significantly different under other densities.Multiple comparisons for BL and ERN showed that there was no significant difference under all the planting densities.