种植密度对夏谷农艺性状及产量的影响

摘要

[目的]研究不同种植密度对夏谷农艺性状及产量的影响.[方法]以金选6号为试验材料,采用随机区组设计,共设置6个密度处理,分别为30万、60万、90万、120万、150万、180万株/hm2,分析金选6号的农艺性状、经济性状和抗倒性.[结果]随着密度的增大,植株的株高、茎粗、茎干重、穗长、穗粗、植株干重、穗重、穗粒重、出谷率、千粒重均呈逐渐减小趋势,处理间的差异达极显著水平.谷子产量随密度的增大先增加后减小,当密度为90万株/hm2时,产量达最大值6 038.01 kg/hm2,密度为60万株/hm2时次之,且两者差异不显著.通过SPSS曲线回归获得的二次曲线模型Y=4 762.081 +27.812x-0.161x2为描述谷子种植密度与产量关系的最优模型,当x=86(密度约为86万株/hm2)时,谷子理论产量最大为5 963.16 kg/hm2,与实测的最适种植密度基本一致.[结论]金选6号最佳种植密度为60万~90万株/hm2.%[Objective]Effects of different planting density on agronomic characters and yield of summer foxtail millet were studied.[Method] Jinxuan 6 was used as material.Six density (30×104 ,60×104,90×104,120×104,150×104,180×104 plants /hm2) were set by randomized block design to explore agronimic characters,economic characters,and lodging resistance of Jinxuan 6.[Result]The plant height,stem diameter,stem dry weight,spike length,spike diameter,plant dry weight,spike weight,grains weight per spike,percentage of grain weight and thousand grain weight decreased gradually with the increase of density.And the difference between treatments was significant.The yield of foxtail millet increased first and then decreased with the increase of density.The yield reached to maximum 6 038.01 kg/hm2 when the density was 90×104plants/hm2 ,while the density 60×104 plants/hm2 next.And the difference between the two was not significant.By curvilinear regression analysis with SPSS,the quadratic curve model Y=4 762.081+27.812x-0.161x2 was the suitable model to describe the relationship between planting density and yield.When the density was 86×104plants/hm2 the yield reached to maximum 5 963.16 kg/hm2.The suitable theoretical density was basically consistent with the actual one.[Conclusion]The suitable planting density of Jinxuan 6 was 60×104plants/hm2 to 90×104plants/hm2.