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作为大豆氮素给源,可以区分为来自施肥、根瘤和地力三方面。本试验通过施用和测定重氮硫酸铵数量,以确定来自施肥的吸氮量。通过测定与大豆吸氮力相当的马齿型玉米的吸氮力,间接求出大豆来自地力的氮素吸收量。求出大豆吸收的全氮量以后,可以计算出来自根瘤的氮素量。
As a source of soybean nitrogen, can be divided into three aspects from fertilization, nodules and fertility. This test determines the amount of nitrogen uptake from fertilization by applying and measuring the amount of ammonium diazonium sulfate. The nitrogen uptake of soybeans from soil fertility was indirectly determined by measuring the nitrogen uptake of dent corn with a comparable nitrogen uptake capacity. After determining the amount of total nitrogen absorbed by the soybean, the amount of nitrogen from the nodule can be calculated.