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Ito, O and Tobita, S and Matsunaga, R and Rao, T P and Johansen, C (1992) Inorganic Nitrogen In Soil Water Collected From Soil Under Intercrop Components Sorghum And Pigeonpea - A Pot Experiment. In: Proceedings of the International Symposium, 1992, Ludhiana, India.
Matsunaga, R and Ito, O and Tobita, S and Rao, T P (1992) Response Of The Pigeonpea (Cajanus Cajan (L.) Millspaugh) To Nitrogen Application And Temporary Waterlogging. In: Root Ecology and its Practical Application proceedings of the 3d ISRR-symposium, 2nd - 6th September 1991, Wien, Austria.
Ito, O and Matsunaga, R and Tobita, S and Tao, T P (1992) Rooting Behavior Of Intercropped Pigeonpea (Cajanus Cajan (L.) Millspaugh) And Sorghum (Sorghum Bicolor (L.) Moench). In: Root Ecology and its Practical Application proceedings of the 3d ISRR-symposium, 2nd - 6th September 1991, Wien, Austria.
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
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
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
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.
Kumar Rao, J V D K and Johansen, C and Yoneyama, T and Tobita, S and Ito, O (1996) Estimation of Nitrogen Fixation by the Natural 15N-abundance Technique and Nitrogen Uptake by Pigeonpea Genotypes of Different Maturity Groups grown in an Inceptisol. Journal of Agronomy and Crop Science, 177 (2). pp. 129-138. ISSN 1439-037x
Adu-Gyamfi, J J and Katayama, K and Devi, G and Rao, T P and Ito, O (1996) Estimation of Soil Nitrogen Status in Intercropping Through Soil Solution. In: Proceedings of the International Workshop: Dynamics of Roots and Nitrogen in Cropping Systems of the Semi-Arid Tropics, 21-25 November 1994, ICRISAT Patancheru, Andhra Pradesh, India.
Adu-Gyamfi, J J and Katayama, K and Devi, G and Rao, T P and Ito, O (1996) Improvement of Soil and Fertilizer Nitrogen Use Efficiency in Sorghum/Pigeonpea Intercropping. In: Proceedings of the International Workshop: Dynamics of Roots and Nitrogen in Cropping Systems of the Semi-Arid Tropics, 21-25 November 1994, ICRISAT Patancheru, Andhra Pradesh, India.
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
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
Adu-Gyamfi, J J and Ito, O (1997) Nitrogen Management in Sorghum/Pigeonpea Intercrop. In: Extending nitrogen fixation research to farmers' fields: proceedings of an International Workshop on Managing Legume Nitrogen Fixation in the Cropping Systems of Asia, 20-24 Aug 1996, ICRISAT Asia Center, Patancheru, Andhra Pradesh, India.
Lee, K K and Wani, S P and Sahrawat, K L and Trimurtulu, N and Ito, O (1997) Nitrogen and/or phosphorus fertilization effects on organic carbon and mineral contents in the rhizosphere of field grown sorghum. Soil Science and Plant Nutrition, 43 (1). pp. 117-126. ISSN 0038-0768
Adu-Gyamfi, J J and Ito, O and Yoneyama, T and Katayama, K (1997) Nitrogen management and biological nitrogen fixation in sorghum / pigeonpea intercropping on Alfisols of the semi-arid tropics. Soil Science and Plant Nutrition, 43. pp. 1061-1066.
Adu-Gyamfi, J J and Ito, O and Yoneyama, T and Devi, G and Katayama, K (1997) Timing of N fertilization on N2 fixation, N recovery and soil profile nitrate dynamics on sorghum/pigeonpea intercrops on Alfisols on the semi-arid tropics. Nutrient Cycling in Agroecosystems, 48 (3). pp. 197-208.
Krishnamurthy, L and Ito, O and Johansen, C and Saxena, N P (1998) Length to weight ratio of chickpea roots under progressively receding soil moisture conditions in a Vertisol. Field Crops Research, 58 (3). pp. 177-185.
Sanetra, C M and Ito, O and Virmani, S M and Vlek, P L G (1998) Remobilization of nitrogen from senescing leaves of pigeonpea (Cajanus cajan (L.) Millsp.): genotypic differences across maturity groups? Journal of Experimental Botany, 49 (322). pp. 853-862. ISSN 0022-0957
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
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 Adu-Gyamfi, J J and Rao, T P (2000) Analysis of Relationship between Root Length Density and Water Uptake by Roots of Five Crops Using Minirhizotron in the Semi-Arid Tropics. JARQ - Japan Agricultural Research Quarterly, 34 (2). pp. 81-86. ISSN 0021-3551
Nakamura, T and Adu-Gyamfi, J J and Yamamoto, A and Ishikawa, S and Nakano, H and Ito, O (2002) Varietal differences in root growth as related to nitrogen uptake by sorghum plants in low-nitrogen environment. Plant and Soil, 245 (1). pp. 17-24.
Gopalakrishnan, S and Subbarao, G V and Nakahara, K and Ito, O (2006) Nitrification Inhibition (NI) compounds from Brachiaria humidicola, a tropical grass. In: 30th International Symposium on High performance Liquid Phase Separations and Related Techniques(HPLC 2006), 17-23 June 2006, San Francisco, USA.
Kashiwagi, J and Krishnamurthy, L and Singh, Sube and Gaur, P M and Upadhyaya, H D and Panwar, J D S and Basu, P S and Ito, O and Tobita, S (2006) Relationships between Transpiration Efficiency and Carbon Isotope Discrimination in Chickpea (C. arietinum L). Journal of SAT Agricultural Research, 2 (1). pp. 1-3. ISSN 0973-3094
Gopalakrishnan, S and Watanabe, T and Ito, O and Subbarao, G (2007) Root exudates of Brachiaria humidicola, a tropical pasture grass, and its effect on nitrification and soil microorganisms. In: “Rhizosphere 2” conference, 26-31 Aug 2007, Montpellier, France.
Subbarao, G V and Hossain, Z A K M and Nakahara, K and Ishikawa, T and Yanbuaban, M and Yoshihashi, T and Ono, H and Mitsuru, Y and Hash, C T and Upadhyaya, H D and Srinivasa, P and Reddy, B V S and Ito, O and Sahrawat, K L (2009) Biological Nitrification Inhibition (BNI) Potential in Sorghum. In: The Proceedings of the International Plant Nutrition Colloquium XVI, Department of Plant Sciences, UC Davis, 2009, UC Davis,California,United States.
Subbarao, G V and Kishii, M and Nakahara, K and Ishikawa, T and Ban, T and Tsujimoto, H and George, T S and Berry, W L and Hash, C T and Ito, O (2009) Biological nitrification inhibition (BNI) - is there potential for genetic interventions in the Triticeae. Breeding Science, 59 (5). pp. 529-545.
Gopalakrishnan, S and Watanabe, T and Pearse, S J and Ito, O and Hossain, Z A K M and Subbarao, G V (2009) Biological nitrification inhibition by Brachiaria humidicola roots varies with soil type and inhibits nitrifying bacteria, but not other major soil microorganisms. Soil Science and Plant Nutrition, 55 (5). pp. 725-733.
Ramu, Karri and Watanabe, T and Uchino, H and Sahrawat, K L and Wani, S P and Ito, O (2012) Fertilizer induced nitrous oxide emissions from Vertisols and Alfisols during sweet sorghum cultivation in the Indian semi-arid tropics. Science of the Total Environment, 438. pp. 9-14. ISSN 0048-9697
Uchino, H and Watanabe, T and Ramu, Karri and Sahrawat, K L and Marimuthu, S and Wani, S P and Ito, O (2013) Calibrating Chlorophyll Meter (Spad-502) Reading by Specific Leaf Area for Estimating Leaf Nitrogen Concentration in Sweet Sorghum. Journal of Plant Nutrition, 36 (10). pp. 1640-1646. ISSN 0190-4167
Uchino, H and Watanabe, T and Ramu, Karri and Sahrawat, K L and Marimuthu, S and Wani, S P and Ito, O (2013) Effects of Nitrogen Application on Sweet Sorghum (Sorghum bicolor (L.) Moench) in the Semi-Arid Tropical Zone of India. JARQ - Japan Agricultural Research Quarterly, 47 (1). pp. 65-73. ISSN 0021-3551
Krishnamurthy, L and Kashiwagi, J and Tobita, S and Ito, O and Upadhyaya, H D and Gowda, C L L and Gaur, P M and Sheshshayee, M S and Singh, Sube and Vadez, V and Varshney, R K (2013) Variation in carbon isotope discrimination and its relationship with harvest index in the reference collection of chickpea germplasm. Functional Plant Biology, 14 (12). pp. 1350-1361. ISSN 1445-4408
Thudi, M and Upadhyaya, H D and Rathore, A and Gaur, P M and Krishnamurthy, L and Roorkiwal, M and Nayak, S N and Chaturvedi, S K and Basu, P S and Ganga Rao, N V P R and Fikre, A and Kimurto, P and Sharma, P C and Sheshashayee, M S and Tobita, S and Kashiwagi, J and Ito, O and Killian, A and Varshney, R K (2014) Genetic Dissection of Drought and Heat Tolerance in Chickpea through Genome-Wide and Candidate Gene-Based Association Mapping Approaches. PLoS ONE, 9 (5). e96758. ISSN 1932-6203
Kashiwagi, J and Krishnamurthy, L and Purushothaman, R and Upadhyaya, H D and Gaur, P M and Gowda, C L L and Ito, O and Varshney, R K (2015) Scope for improvement of yield under drought through the root traits in chickpea (Cicer arietinum L.). Field Crops Research, 170 (-). pp. 47-54. ISSN 1872-6852
Uchino, H and Watanabe, T and Ramu, K and Sahrawat, K L and Marimuthu, S and Wani, S P and Ito, O (2015) Dynamics of Fertilizer Nitrogen Applied to Sweet Sorghum (Sorghum bicolor (L.) Moench) in the Semi-Arid Tropics. Japan Agricultural Research Quarterly, 49 (04). pp. 409-418. ISSN 2185-8896