不同种植密度对百玉2号穗部性状及产量的影响

Effect of planting density on ear characters and yield of Baiyu No.2 variety

百玉2号属紧凑型高产玉米品种,通过设置5个种植密度处理,研究不同密度对该品种的产量及其部分植株性状的影响.结果表明：叶面积指数随种植密度的增加差异较大,苗期叶面积指数增长缓慢（0.12-0.28）,抽雄期达到最高（4.42-5.87）,灌浆期后下降;果穗性状随着种植密度的增加呈现出不同的差异性,穗长受密度影响比较明显（15.28-12.59 cm）,变化幅度较大,穗粗的差异性不明显（4.83-4.40 cm）,变化幅度较小,5个密度中以5 000株/667 m2时产量较高为666 kg/667 m2,在密度范围4 000株/667 m2-6 500株/667 m2内,均可获得550 kg/667 m2的产量水平.在生产实际中各地可根据当地栽培目的（粮、饲草兼用的可走密度上限）、田间管理水平、土地肥水基础等灵活掌握较适宜的种植密度.

Baiyu No.2 belongs to compact high-yielding maize varieties.In this experiment,we studied the impact on the yield and characters with 5 different density treatments.The results showed that the leaf area index had large differrences with the increase of planting density at early stage and the leaf area index （0.12-0.28） grew slowly at seedling stage as well as reached the maximum values （4.42-5.87） at anthesis stage,but dropped at filling stage;Ear characters presented various differences with the increase of planting density and ear length was affected significantly （15.28 -12.59 em） with great variational amplitude, while ear width had no obvious difference （4.83 -4.40 cm） and showed little change.The highest yield peak of planting density for Baiyu No.2 was 5 000 plants/667 m2,the yield was 666 kg/667 m2.