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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
Katayama, K and Ito, O and Matsunaga, R and Adu-Gyamfi, J J and Rao, T P and Anders, M M and Lee, K K (1995) Nitrogen balance and root behavior in four pigeonpea-based intercropping systems. Fertilizer Research, 42 (1-3). pp. 315-319.
Matsunaga, R and Ito, O and Tobita, S and Rao, T P and Johansen, C (1994) Response of short-duration pigeonpea to nitrogen application after short-term waterlogging on a Vertisol. Field Crops Research, 38 (3). pp. 167-174. ISSN 0378-4290
Gupta, S C and Kapoor, R K and Rao, T P and Ariyanayagam, R P (1992) Identification and inheritance of a new dwarfing gene in pigeonpea. Indian Journal of Genetics and Plant Breeding, 52 (2). pp. 144-148. ISSN 0019-5200
Rupela, O P and Singh, Onkar and Sivaramakrishna, C and Rao, T P (1991) Maintenance of Seed Purity in Nonnodulating Lines of Chickpea. International Chickpea Newsletter, 23. p. 43.
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
Devi, G and Rao, T P and Adu-Gyamfi, J J and Katayama, K and Ito, O (1996) Simulation of Rooting Profile Using Soil Properties, Crop Characteristics, and Climatic Data. Series on International Agricultural Research, 3. pp. 573-584. ISSN 1341-3899
Katayama, K and Ito, O and Adu-Gyamfi, J J and Rao, T P and Dacanay, E V and Yoneyama, T (1999) Effects of NPK fertilizer combinations on yield and nitrogen balance in sorghum or pigeonpea on a vertisol in the Semi-Arid Tropics. Soil Science and Plant Nutrition, 45 (1). pp. 143-150. ISSN 0038-0768
Katayama, K and Ito, O and Rao, T P (1998) Seedling characteristics and retention of current photosynthates in leaves in relation to initial growth in pigeonpea (Cajanus cajan L. Millsp.) and cowpea (Vigna sinensis Endl.). Soil Science and Plant Nutrition, 44 (3). pp. 477-480. ISSN 0038-0768