种植密度对高淀粉玉米郑单19产量和产量构成因素的影响

Effect of Plant Density on Yield and Its Component Factors of High Starch Maize Zhengdan No.19

以高淀粉玉米品种郑单19为材料,研究种植密度(4.5、6.0、7.5、9.0万株.hm-2)对玉米籽粒产量的影响。结果表明:密度对高淀粉玉米郑单19的产量有显著影响。随密度的增加,穗粒数、穗粒重和百粒重降低,穗变小,而穗数增加。密度与产量的关系为y=-202.22x2+2790.67x+82.98,籽粒产量呈单峰曲线变化。随着密度由4.5万株.hm-2增加到7.5万株.hm-2,玉米籽粒产量逐渐提高;密度由7.5万株.hm-2增加到9万株.hm-2,玉米籽粒产量则逐渐下降。

High starch maize hybrid Zheng-dan No. 19 was used to investigate the effect of plant density （45 000, 60 000, 75 000, 90 000 plants · hm^-2）on yield. The results showed that： Effect of plant density on yield of high starch maize Zhengdan No. 19 was remarkable. Kernels per ear, kernel weight of ear and weight of 100 kernels decreased and ears number increased with plant densities increasing from 45 000 to 90 000 plants· hm^-2. The relation of plant density to yield of maize was y= - 202. 22x^2 ＋ 2790.67x＋82. 98： grain yield presented single-peaked curve. Grain yield increased with plant densities in- creasing from 45 000 to 75 000 plants · hm^-2 ,but when it over 75 000 plants· hm^-2 ,grain yield reduced.