施氮量和留苗密度对不同株型谷子产量及产量相关性状的影响

Effects of Different Planting Densities and Nitrogen Application Levels on Yield and Its Related Traits of Foxtail Millet

采用裂区设计,以披散型品种济谷14和相对紧凑型品种豫谷18为试验材料,以留苗密度为主区,以氮肥为副区,对谷子的产量和产量相关性状进行了研究。结果表明:施氮量和留苗密度对济谷14和豫谷18株高、茎粗、穗长、穗粗均无显著性影响。施氮对济谷14和豫谷18产量的影响达显著水平,随着施氮量增加,济谷14群体产量表现为先增后降;豫谷18产量随施氮量的增加而增加。留苗密度对豫谷18与济谷14的群体产量影响不显著。叶面积指数随生育期的推进呈单峰变化,并且随密度的增加济谷14和豫谷18的叶面积指数呈上升趋势。随施氮量的增加,济谷14叶面积指数出现先增加后降低的趋势,而豫谷18一直呈上升趋势。

A split-plot design with the planting densities as main plots and nitrogen（N） fertilizer levels as sub-plot was adopted to study their effects on yield and its related traits of foxtail millet cultivars Jigu 14 and Yugu 18.The results showed that application level of N fertilizer and plant density had no significant influence on Jigu 14 and Yugu 18 in plant height,stem diameter,spike length and spike diameter.There were significant differences in the yield of Jigu 14 and Yugu 18 under the application of N fertilizer.With the increase of N application level,the yield of Jigu 14 increased firstly and then decreased,while that of Yugu 18 increased.No significant differences in population yield were found under different planting densities.The leaf area index（LAI） assumed the single peak change curve and increased with the increase of plant density.With the increase of N application levels,the LAI of Jigu 14 increased firstly and then decreased,while that of Yugu 18 always increased.