鲜食糯玉米高密度制种试验研究

Study on Seed Production of Table Waxy Corn under High Planting Density

试验设 5 0 0 0 ,5 5 0 0 ,6 0 0 0 ,6 5 0 0 ,70 0 0 ,75 0 0株 6 6 6 .7m2 共 6个密度 ,研究鲜食玉米沪玉糯 1号在西北地区高产制种的合理密度。结果表明 ,不同密度处理制种产量间差异达极显著水平 ,在一定范围内 ,制种产量随密度增加而增加 ,呈二次曲线变化。由回归模型得出沪玉糯 1号最佳制种密度为 74 15株 6 6 6 .7m2 。株高和穗位高随密度增加而上升 ,茎粗则略有下降 ,果穗变化较小 ,未有倒伏现象 ,表明沪玉糯 1号母本申W 2 2耐密植性好 ,合理高密度制种能获得高产量。

The experiments of seed production of table waxy corn hybrid Huyunuo No.1 under different planting densities were carried out in the Northwest of China in order to get high seed yield under rational close planting. The results showed that there was a very significant difference between seed yields under different planting densities, and within some extent of planting density the seed yield increased with the planting density increasing, assuming a quadratic curve. The regression analysis showed that the optimum planting density of seed production for Huyunuo No.1 was 7415 plants/666.7m 2. The plant height and ear height increased with the density increasing, but the stem diameter slightly decreased, the ear varied less and no plant lodged under high planting density, which indicates that the female parent of Huyunuo No.1, Shen-W 22 has a good tolerance to high density, and the high seed yield can be obtained under rational close planting.