多年生豆科牧草是比豆类作物更有效的固氮者,在良好的共生条件下,一个生长季它们每公顷能够固定300～400甚至600公斤大气氮素,而豆类作物为150～200,最多为300公斤。不同牧草的潜在固氮活性不一样,例如杂三叶和草木樨的比红三叶和苜蓿的低。有时,潜在固氮活性较低的植物往往比活性大的植物固定的氮素多,这是受牧草对环境条件要求的特异性所制约的。 Perennial legumes are more efficient nitrogen-fixing organisms than leguminous crops and can maintain 300-400 or even 600 kg of atmospheric nitrogen per hectare under good symbiotic conditions compared to 150-200 for legumes It is 300 kilos. Different forages have different potential for nitrogen fixation, such as the lower trichothecium and licorice than red clover and alfalfa. Occasionally, plants with a lower potential for nitrogen fixation tend to have more nitrogen than the more labile plants, as dictated by the specific environmental requirements of the pasture.