豆科牧草如白三叶的固氮量决定于两个主要因素:其一为植株所结根瘤的有效性;其二为环境因素的影响,诸如物理性(温度、光照、湿度)的和管理(家畜和肥料,特别是氮肥)上的影响。本文论述对白三叶固氮的上述影响的田间试验结果。有效的根瘤是固氮的先决条件,豆科植物如白三叶,可以从土壤中选择那些能 The amount of nitrogen fixation in legumes, such as white clover, is determined by two main factors: one is the effectiveness of the nodule on the plant; the other is the effect of environmental factors such as physical (temperature, light, humidity) and management Livestock and fertilizers, especially nitrogenous fertilizers. This article discusses the field test results on the above effects of nitrogen fixation on white clover. Effective nodules are a prerequisite for nitrogen fixation. Legumes, such as white clover, can select from the soil those that can