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N2-fixation percentages in the aerial parts of the first and second cuttings of five species of leguminous shrub plants.i.e.Lespedeza formosa(Vog.) Koehne from Jiangxi,Lespedeza pilosa(Thunb.) Sieb et Zucc.,Lespedeza formosa(Vog.) Koehne from Zhejiang,Caj