不同播期下低芥酸油菜利用氮肥的研究

应用~(15)N示踪法,对甘蓝型油菜(Brassica napus L.)低芥酸品种“中油低芥三号”在不同播期下对氮肥的利用进行了研究。结果表明,在正常播期范围内,早播油菜比晚播油菜的氮吸收总量,吸收自肥料氮的百分率、氮肥利用率、氮肥生产效率、磷吸收量和磷生产效率都明显增加。因此生物产量、菜籽产量、产油量和含油率都显著提高。菜油中芥酸含量随播期推迟而稍有上升、但差异不显著。

STUDIES ON NITROGEN UPTAKE AND UTILIZATION BY RAPE (Brassica napus L.) UNDER DIFFERENT SOWING DATES

The nitrogen uptake and utilization by low erucic acid variety,Zh-ong-You-Di-Gai No.2,of rape(Brassica napus L.) under different sowing dates were studied.The results are as follows:Total N uptake,t,he percentage N derived from the fertilizer,the rate of utilization of nitrogenous fertilizer,the production efficiency of N-fertilizer ( seed yield g/gN derived by rape plant from the fertilizer ),total P uptake and the production efficiency of phosphorus (seed yield g/gP derived by rape plant,from fertilizer and soil ) were all signi-.ficantly higher at early sowing than that at later sowing within the range of normal sowing dates.Therefore,the biomass yield,the seed yield and oil content all increased singnificantly at early sowing treatment,but erucic acid content showed no significant difference.