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Tobita, S and Ito, O and Matsunaga, R and Rao, T P and Rego, T J and Johansen, C and Yoneyama, T (1994) Field evaluation of nitrogen fixation and use of nitrogen fertilizer by sorghum/pigeonpea intercropping on an Alfisol in the Indian semi-arid tropics. Biology and Fertility of Soils, 17 (4). pp. 241-248. ISSN 0178-2762
Devi, G and Ito, O and Matsunaga, R and Tobita, S and Rao, T P and VidyaLakshmi, N and Lee, K K (1996) Simulating Root System Development of Short-duration Pigeonpea. Experimental Agriculture, 32 (1). pp. 67-68. ISSN 1469-4441