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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
Hayashi, K and Abdoulaye, T and Matsunaga, R and Tobita, S (2012) Appraisal of Local Farmers’ Practices on Land Management for a Guideline of Agricultural Development in the Sahel Zone of Niger. JARQ - Japan Agricultural Research Quarterly, 43 (1). pp. 63-69. ISSN 0021-3551
Rao, T P and Ito, O and Matsunaga, R (1993) Differences in uptake kinetics of ammonium and nitrate in legumes and cereals. Plant and Soil, 154 (1). pp. 67-72. ISSN 0032-079X