环境因子的限制一直是豆科植物-根瘤菌共生固氮体系没有在农业生产中充分发挥作用的重要原因之一。
Environmental factors are always one of the major reasons why the symbiotic nitrogen-fixing system of rhizobia and legumes cannot come into full play in agricultural production.
豆科植物的根瘤固氮占生物固氮总量的40%。
Nitrogen fixed by legume root nodules accounts for 40% of total biological nitrogen fixation.
豆科植物由于其高的粗蛋白含量，良好的适口性，较高的生产力及经济有效的固氮价值越来越受到人们的重视。
Leguminous plant has been thinking highly because its high protein content, good palatability, higher productivity, economic and high-performance nitrogen fixation is attracted increasing attention.
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