【摘要】 为了分析不同密度处理下籽粒机收玉米的农艺性状和产量及产量构成指标,本研究以籽粒机收玉米新品种‘鲁单608’为供试材料,设置6万株/hm²（D₁）、6.9万株/hm²（D₂）、7.5万株/hm²（D₃）、8.25万株/hm²（D₄）、9万株/hm²（D₅）5个种植密度对其农艺性状和产量进行分析。研究结果显示,随着种植密度的提高,株高、穗位高、倒伏率和空秆率都有所增加,而双穗率则有所下降。玉米产量在8.25万株/hm²密度处理下最高,达到11231.31 kg/hm²。随种植密度的增加,LAI逐渐增加。干物质积累在个体和群体层次上均呈现“慢-快-慢”的“S”型增长曲线,单株干物质积累量随种植密度的增加而降低,群体干物质产量在D₁～D₄的密度范围内,随种植密度增加而增加,当种植密度超过D₄时,群体干物质积累量开始降低。更多还原

【Abstract】 In order to analyze the agronomic traits,yield and yield composition of machine-harvested maize under different density treatments,machine-harvested maize ’Ludan 608’ was used as the material.Five planting densities of 60000 plants/hm²（D₁）,69000 plants/hm²（D₂）,75000 plants/hm²（D₃）,82500 plants/hm²（D₄） and 90000 plants/hm²（D₅） were set to analyze their agronomic traits and yield.The results showed that plant height,ear height,lodging rate and bare plant rate increased with the increase of planting density,while double ear rate decreased.The highest maize yield was 11231.31 kg/hm² with the planting density of82500 plants/hm².The LAI increased with the increase in planting density.The accumulation of dry matter in maize at both individual and population levels showed an ’S-shaped’ growth curve of ’slow-fast-slow’.The dry matter amount of single plant decreased with the increase in planting density.In the range of D₁-D₄,dry matter amount of population increased with the increase of planting density.And it began to decrease when planting density was more than D₄.更多还原