Pedosphere 8(1): 33--36, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Evaluation of N2-fixing capacities of herbaceous and shrub legumes under field condition
XING Guang-Xi, SHI Shu-Lian, CAO Ya-Cheng, DU Li-Juan, SUN Guo-Qing and ZHOU Ke-Yu
Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China)
      Natural 15N abundance method was used in this study to investigate the N2-fixing capacities of several herbaceous and shrub legumes by a field experiment. For herbaceous legumes, the results were in consistent with those obtained by a pot experiment. Crotalaria mucronata Desv. had a higher N2-fixing capacity than Vigna sinensis (L.) Savi. For shrub legumes, N2-fixing capacity under field condition was slightly different from that in pot experiment. These results demonstrated that the natural 15N abundance method was applicable to evaluating N2-fixing capacities of herbaceous and shrub legumes, and that pot experiment was suitable for evaluating the N2-fixing capacities of not only herbaceous legumes but also shrub legumes. Leguminous N2-fixing plants differed in response to phosphorus fertilization. Phosphorus fertilizer application greatly increased the percentage of nitrogen derived from air (% N dfa) and total amount of N2 fixed by Lespedeza formosa (Vog.) Koehne (Jiangxi). Phosphorus fertilizer showed no significant effect on the N2-fixing percentage of Cajanus cajan (L.) Millsp. but increased its total biomass, thus increasing the total amount of N2 fixed.
Key Words:  herbaceous legumes, natural 15N abundance method, N2-fixing capacity, shrub legumes
Citation: Xing, G. X., Shi, S. L., Cao, Y. C., Du, L. J., Sun, G. Q. and Zhou, K. Y. 1998. Evaluation of N2-fixing capacities of herbaceous and shrub legumes under field condition. Pedosphere. 8(1): 33-36.
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