甘蓝型三系杂交油菜春播制种技术研究——Ⅵ 适宜行比与密度研究

STUDY ON TECHNIQUE FOR SEED PRODUCTION OF TERNARY HYBRID COLE-RAPE SOWING IN SPRING——Ⅳ. EXPERIMENT OF OPTIMUM ROW-RATIO AND DENSITY

三系杂交油菜春播制种父母本采取1:3、1:4和1:5分别比1:2增产5.9％、7.8％和16.4％;每窝留苗数4株和5株比3株增产5.5％和7.8%;采用1:4和1:5行比每窝留苗4～5株亩留苗3～4万株亩产杂种可达45公斤以上。不同行比的不育株率可控制在5％左右。

In the 'Row-ratio and density'experiment of ternary hybrid cole-rape in seed production field, the seed yields of the three different parent ratios 1 : 3,1:4 and 1 : 5 increased by 5.9%,7.8% and 16.4% compared with 1 : 2 respectively. Four or five seedling each dibble increased by 5.5% and 7.8% in order of comparing with three seedlings each dibble. The hybrid seed yield of thirty or forty thousand seedling per mu or fowr or five seedlings each dibble with 1 : 4 or 1 : 5 row-ratio is over 45kg. The sterile plant rate of different row-ratio could be controlled about 5%.