摘要
对苏玉19种植密度和施氮量的试验结果表明:苏玉19的子粒产量可达到12400.7kg/hm2。高产群体质量的主要指标是:控制吐丝期LAI5.04、群体干物质积累量在9000.0kg/hm2基础上,重点增加总粒数,提高粒叶比,提高花后干物质积累量和经济系数。子粒产量(y)与密度(x)的关系为y=-2778.7+4158.5x-301.48x2(R2=9119),最佳密度为6.90万株/hm2。在适宜密度基础上产量(y)与施氮量(x)的关系为y=5454.3+37.476x-0.0669x2(R2=0.8735),最佳施氮量为280.1kg/hm2。
By the experiments of plant density and nitrogen fertilizer in cultivar Suyu 19, the results indicated that the grain yield of Suyu 19 could be reached 12 400.7 kg/ha. The main population quality indices of high yield were that on the basis of controlling LAI 5.04 and the dry matter accumulation at 9 000.0 kg/ha at silking stage, increasing especially the total kernel number, grain-leaf ratio, as well as the dry matter accumulation during grain filling stage and economic coefficient. The relationship between grain yield（y） and density（x） could be described by the regression equation： y=-301.48x^2＋4 158.5x^2 778.7（R2=9 119＊＊）, and the optimum density was 6.90 × 10^4 plants/ha. On the basis of the optimum density, the relationship between grain yield（y） and applied N amount（x） could be described by the regression equation： y=5 454.3＋37.476x-0.066 9x^2 （R^2=0.873 5＊＊）, and the optimum amount of nitrogen fertilizer was 280.1 kgN/ha.
出处
《玉米科学》
CAS
CSCD
北大核心
2006年第3期157-160,共4页
Journal of Maize Sciences
关键词
玉米
苏玉19
高产
密度
施氮量
Maize
Suyu 19
High yield
Density
Applied N quantity
