不同品种在日喀则地区的播期试验研究

从青海农科所引进4个中早熟甘蓝型油菜品种在日喀则地区进行播期试验。结果表明,随着播期推迟,生育期缩短,植株经济性状、产量构成因子、产量呈下降趋势；产量以4月27日播种的最高；超过5月17日播种,在生育期后期易受秋季早霜影响,大部分品种不能正常成熟。因此甘蓝型油菜品种在日喀则地区的适宜播期可定为4月下旬。

Sowing Time of Different Brassica napus Varieties in Shigatse

This paper aims at selecting proper cultivation varieties of Brassica napus in Shigatse, Tibet. Variety ‘2137’,‘Qingza 4’,‘Qingza 7’and‘Jinghua 165’introduced from Qinghai Academy of Agricultural Sciences were used as materials. The growth period, economic traits and yield traits were studied by means of different sowing time. The results showed that the growth period was shortened and the plants’economic traits, yield components and yield decreased with the postponing of sowing time. The yield was the highest when the sowing was carried out on April 27, and sowing after May 17 could probably make the plants expose to early frost of autumn and result in the failure of natural maturity. Therefore, the appropriate sowing time of B. napus varieties in Shigatse can be set in late April.