栽培密度对吉杂141群体生理指标及产量的影响

目的]明确矮秆早熟高粱品种吉杂141在佳木斯地区的合理栽培密度。方法]以吉杂141为研究对象,在大田生产试验条件下,采用平播的方式,设置15万、20万、25万、30万、35万株/hm2共5个栽培密度,研究不同栽培密度下,吉杂141的群体生理指标、产量及产量性状。结果]随着栽培密度的增大,叶面积指数增加,叶绿素含量下降,群体光合势和总光合势增加,株高差异不显著,穗长、穗粗逐渐下降,生物产量上升,千粒重和单穗重下降。结论]初步明确在佳木斯地区采用平播方式吉杂141最适栽培密度为20万株/hm2,产量可达9 203.36 kg/hm2。

Effects of Planting Density on Yield and Agronomic Traits of Early Maturing Short-Stalked New Variety Sorghum Jiza141

Objective] To find the rational planting density of early maturing short-stalked new variety sorghum Jiza141 in Jiamusi Area. Method] With Jiza 141 as the research object, field experiment was carried out.Five cultivating densities were designed, which were 150 000, 200 000, 250 000, 300 000 and 350 000 plants/hm2 .Under the different planting density, the population physiological index, yield and yield traits of Jiza 141 were researched.Result] With the increase of planting density, leaf area index increased, chlorophyll content de-clined, population photosynthetic potential and total photosynthetic potential enhanced, plant height showed no significant differences; ear length and width gradually reduced, biological yield increased, 1 000-grain weight and single panicle weight decreased. Conclusion] It is preliminarily found that in Jiamusi Area, the optimal cultivation density of Jiza 141 is 200 000 plants/hm2; and the yield reaches 9 203.36 kg/hm2 .