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[9]
Time-course of nitrogen fixation in two bambara groundnut ( Vigna subterranea L. Verdc.) cultivars[J] . F. Kumaga,S. K. A. Danso,F. Zapata.Biology and Fertility of Soils . 1994 (3)
[10]
Ontogenic variation in nitrogen fixation and accumulation of nitrogen in mungbean, blackgram, cowpea, and groundnut[J] . R. Senaratne,D. S. Ratnasinghe.Biology and Fertility of Soils . 1993 (2)