不同密度对玉米杂交种几个相关性状的影响

Effects of Different Density on Related Traits of Maize Hybrids

采用4个密度梯度,探讨密度对不同类型玉米品种相关性状的影响。试验结果表明,在本试验条件下,随着密度的升高,不同玉米品种植株株高、穗位高均有所升高,但矮秆紧凑型品种表现不明显,而中高秆半紧凑型品种株高增高显著。密度对辽单565的穗粒数和百粒重影响相对较小,对辽单527影响相对较大。随着密度的升高,穗长穗粗降低,秃尖增大,植株个体产量降低,但群体产量增加。密度对玉米干物质积累的影响,在苗期到拔节期影响较小,在抽雄期开始至吐丝到成熟,对群体干物质积累影响呈上升趋势,并且在抽雄期影响最为显著。

The 4 density gradient,to explore the effect of density on different types of maize varieties related traits.Our results showed that,the plant height and ear height increased as the density advanced.For the dwarf compact type hybrid,the coefficient of plant height and ear height was not significant.For in the tall semi-compact type hybrid,the coefficient of plant height and ear height was positively significant.Density had a smaller effect in ear grain number and 100-grains weight for Liaodan 565,while had a greater effect for Liaodan 527.The ear grain number and 100-grains weight decreased as the density increased.a shorter and thinner ear with more severe barren ear tip was observed,and then the single plant yield decreased.However,The population yield increased.In this study.The dry matter accumulated slowly from seedling to jointing stage.Individual and population dry matter accumulation presented increasing trends from heading and silking to maturing stage,and increased rapidly at heading stage.