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Rao, J V D K K and Thompson, J A and Sastry, P V S S and Giller, K E and Day, J M (1987) Measurement of N2-fixation in field-grown pigeonpea [Cajanus cajan (L.) Millsp.] using15N-labelled fertilizer. Plant and Soil, 101 (1). pp. 107-113. ISSN 0032-079X