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在大豆生育需氮的高峰期,本身固氮量又约占其全氮量的1/5。~(15)N—尿素叶面示踪证明,尿素氮能迅速有效地传入氮库。生产验证叶面给氮可以缓解大豆花荚期氮素供需之间的矛盾。
At the peak of nitrogen demand in soybean, its nitrogen fixation accounts for about 1/5 of its total nitrogen. ~ (15) N-urea foliar trace shows that urea nitrogen can quickly and efficiently introduced into the nitrogen pool. Production verification of foliar nitrogen can alleviate the contradiction between supply and demand of soybean during flowering stage.