Pedosphere 7(1): 43--48, 1997
ISSN 1002-0160/CN 32-1315/P
©1997 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of Bradyrhizobium sp. inoculation on biomass and nodulation of cowpea
ZHAO Yu-Hua1, C. F. FONJI2, D. M. NWAGA2 and LI Wei-Gun3
1 Department of Environmental Sciences, Zhejiang Agricultural University, Hangzhou 510029 (China)
2 Dopartment of Biology and Animal Physiology, Yaounde University (Cameroon)
3 Faculty of Fibres, Zhejiang Institute of Silk Textiles, Hangzhou 310033 (China)
      Vigna unguiculata(L.) Walp (cowpea) is a tropical legume of very high nutritive and economic values. A laboratory experiment was conducted to evaluate the BNF (biological nitrogen fixation) efficiency of 4 strains of Bradyrhizobium sp. (VUXYI, VUIE1, VUMDS1 and VUID1). From the results obtained these strains were classified into efficiency groups, with VUID1 being the most efficient and VUXY1 the least efficient. The effect of inoculation was tested on 2 cowpea varieties in a field experiment. Remarkable increases in nodulation biomass and crop yield were observed. An increase from 58% to 81% in dry seed was obtained for the two varieties. A significance test revealed a significantly positive correlation between nodulation and biomass.
Key Words:  Bradyrizobium, inoculation, nodulation, rhizobacteria, Vigna unguiculata
Citation: Zhao, Y. H., Fonji, C. F., Nwaga, D. M. and Li, W. G. 1997. Effect of Bradyrhizobium sp. inoculation on biomass and nodulation of cowpea. Pedosphere. 7(1): 43-48.
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