玉米高产栽培群体密度与性状指标研究

Study on Colonial Density and Character Index of Maize High-yielding Cultivation

对3个综合性状突出的玉米品种在高产施肥水平下进行不同密度的栽培试验。结果表明,不同品种适宜的高产栽培密度不同,陕单8806和郑单958在6万～7.5万株/hm2,不能低于6万株/hm2,京科519在6万株/hm2左右,不能高于7.5万株/hm2。这3个品种在陕西关中夏播区的高产栽培群体性状指标为LAI在5.5左右,GAR在14.0 g/m2.d以上,吐丝期全株的光能截获量在92%以上,穗位以下叶的光能截获量不低于14%。

Three kinds of maize with outstanding colonial synthesis character were tested in fertilization of high-yielding and different densities. It was founded that variant varieties adapted to different colonial densities, Shandan 8806 and Zhengdan 958 adapt to be planted at 60 000 - 75 000 plants/ha, and could not be planted under 60 000 plants/ha, Jingke 519 adapts to be planted at 60 000 plants/ha, could not be planted above 75 000 plants/ha. Character index of three kinds of maize in summer seeding area of Guanzhong of Shaanxi province was that LAI was about adapted for 5.5, GAR was ensured to high 14.0 g/m^2· d, intercepting and capturing luminous energy of total plant was above 92%, that of leaf of low spike was not under 14%.