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Toomsan, B and Rupela, O P and Mittal, S and Dart, P J (1979) Counting chickpea rhizobia in soils. International Chickpea Newsletter, 1. pp. 10-11.
Rupela, O P and Josey, D P and Toomsan, B and Mittal, S and Dart, P J and Thompsan, J A (1980) Application Of Inherent Antibiotic Resistanceto Ecological Studies Of Rhizobia. In: Biological Nitrogen Fixation Technology for Tropical Agriculture, 9-13 March 1981, Cali, Colombia.
Rupela, O P and Dart, P J (1981) Screening For Nodulation Characteristics In Chickpea And Subsequent Generation Of Seeds. In: Biological Nitrogen Fixation Technology for Tropical Agriculture, 9-13 March 1981, Cali, Colombia.
Toomsan, B and Rupela, O P and Dart, P J (1982) Studies on Soil and Rhizosphere Populations of Rhizobium Sp. Nodulating Cicer Arietinum. In: Proceedings of the National Symposium on Biological Nitrogen Fixation, 25th to 27th Feb 1982, Indian Agricultural Research Institute, New Delhi, India.
Rupela, O P and Sudarshana, M R and Mittal, S and Thompson, J A (1984) Chickpea Microbiology: Report of Work 1981-82. Monograph. ICRISAT, Patancheru, Andhra Pradesh, India.
Toomsan, B and Rupela, O P and Mittal, S and Dart, P J and Clark, K W (1984) Counting Cicer-Rhizobium using a plant infection technique. Soil Biology and Biochemistry, 16 (5). pp. 503-507. ISSN 0038-0717
Rupela, O P and Dart, P J and Toomsan, B and Singh, D V and Subramaniam, D and Sharma, B K (1984) Facility for Growing Plants in Test Tubes at ICRISAT. Technical Report. International Crops Research Institute for the Semi-Arid Tropics.
Rupela, O P and Tauro, P (1985) Genetic control of hydrogen sulfide retention in Saccharomyces cerevisiae. Biotechnology Letters, 7 (4). pp. 279-282. ISSN 0141-5492
Singh, Onkar and Rupela, O P and Rheenen, H A van (1986) Genetics of nonnodulation in chickpea. International Chickpea Newsletter, 15. pp. 5-6.
Rupela, O P and Sundarshana, M R (1986) Identification of a nonnodulating spontaneous mutant in chickpea. International Chickpea Newsletter, 15. pp. 13-14.
Sithanantham, S and Rupela, O P (1986) Insect damage to chickpea root nodules. International Chickpea Newsletter, 15. pp. 12-13.
Rupela, O P and Toomsan, B and Mittal, S and Dart, P J and Thompson, J A (1987) Chickpea rhizobium populations: Survey of influence of season, soil depth and cropping pattern. Soil Biology and Biochemistry, 19 (3). pp. 247-252. ISSN 0038-0717
Rupela, O P and Rao, J V D K K (1987) Effects of Drought, Temperature, and Salinity on Symbiotic Nitrogen Fixation in Legumes, with Emphasis on Chickpea and Pigeonpea. In: Consultants' Workshop: Adaptation of Chickpea and Pigeonpea to Abiotic Stresses, 19-21 Dec 1984, ICRISAT, India.
Chauhan, Y S and Nene, Y L and Johansen, C and Haware, M P and Saxena, N P and Singh, S and Sharma, S B and Sahrawat, K L and Burford, J R and Rupela, O P and Kumar Rao, J V D K and Sithanantham, S (1988) Effects of Soil Solarization on Pigeonpea and Chickpea. Information Bulletin No.11. Technical Report. International Crops Research Institute for the Semi-Arid Tropics.
Giller, K E and Sudarshana, M R and Thompson, J A and Rupela, O P (1988) Evaluation of 15N-isotope dilution for measurement of nitrogen fixation in chickpea (Cicer arietinum L.). Biology and Fertility of Soils, 6 (4). pp. 347-351.
Rupela, O P and Sudharshana, M R (1990) Displacement of native rhizobia nodulating chickpea (Cicer arietinum L.) by an inoculant strain through soil solarization. Biology and Fertility of Soils, 10 (3). pp. 207-212. ISSN 0178-2762
Rupela, O P (1990) A Visual Rating System for Nodulation of Chickpea. International Chickpea Newsletter, 22. pp. 22-25.
Singh, Onkar and Rupela, O P (1991) Genetic Relationship Among the Newly Identified Non-nodulating Chickpea Lines. International Chickpea Newsletter, 25. pp. 11-12.
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.
Rupela, O P and Kumar Rao, J V D K and Sudarshana, M R and Usha Kiran, M and Anjaiah, V (1991) Rhizobium Germplasm Resources at ICRISAT Center. Technical Report. International Crops Research Institute for the Semi-Arid Tropics.
Rupela, O P and Mittal, S and Dart, P J and Thompson, J A and Sudarshana, M R and Toomsan, B and Annapurna, K (1991) Variability in Different Characters of Bacteria Nodulating Chickpea. International Chickpea Newsletter, 25. pp. 35-36.
Faris, D G and Rupela, O P (1992) Enhancing Grain Legumes Research in Asia Summary Proceedings of the Asian Grain Legumes Network Coordinators' Meeting. Other. International Crops Research Institute for the Semi-Arid Tropics.
Rupela, O P (1992) Natural occurrence and salient characters of nonnodulating chickpea plants. Crop Science, 32 (2). pp. 349-352. ISSN 0011-183X
Ramakrishna, A and Rupela, O P and Reddy, S L N and Sivaramakrishna, C (1992) Promising herbicides for weed control in chickpea. International Journal of Pest Management, 38 (4). pp. 398-399. ISSN 0967-0874
Wani, S P and Rupela, O P and Lee, K K (1994) BNF technology for sustainable agriculture in the semi-arid tropics. In: Transactions of the 15th World Congress of Soil science, 10 -16 July 1994, Acapulco, Mexico.
Rupela, O P and Wani, S P and Danso, S K A and Johansen, C (1995) Effect of a High Nodulating Selection of Chickpea Cultlvar ICC 4948 on 5011 Properties of a Chlckpea- Sorghum Cropping System Yield and. Journal of soil biology & ecology., 15 (2). pp. 127-134. ISSN 0970-1370
Rupela, O P and Johansen, C (1995) Identification of non-nodulating, and low and high nodulating plants in pigeonpea. Soil Biology and Biochemistry, 27 (4-5). pp. 539-544. ISSN 0038-0717
Wani, S P and Sivaramakrishnan, S and Rupela, O P and Johansen, C and Lee, K K (1995) Partitioning of 14C-Photosynthate in Low and High Nodulating Selections of Chickpea. In: Nuclear methods in Soil-plant aspects of Sustainable agriculture, 5-9 April 1993, Colombo, Sri Lanka.
Wani, S P and Rupela, O P and Lee, K K (1995) Sustainable agriculture in the semi-arid tropics through biological nitrogen fixation in grain legumes. Plant and Soil, 174 (1-2). pp. 29-49. ISSN 0032-079X
Nageswara Rao, R C and Gowda, C L L and Johansen, C and Rupela, O P and Singh, A K and Nigam, S N and Anders, M M and Rego, T J and McDonald, D (1995) A proposal for a working group on acid soil tolerance in grain legumes. In: Plant-soil interactions at low pH: principles and management. Proceedings of the Third International Symposium, 12-16 Sept 1993, Brisbane, Queensland, Australia.
Beck, D P and Rupela, O P (1996) Symbiotic Nitrogen Fixation by Chickpea in WANA and SAT. In: Adaptation of Chickpea in the West Asia and North Africa Region, Nov 1992, ICARDA, Aleppo, Syria.
Gowda, C L L and Ramakrishna, A and Rupela, O P (1997) Agricultural research networks and working groups with special reference to the Working Group on Nitrogen Fixing Legumes in Asia. 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.
Rupela, O P (1997) Field Evaluation of Some Recently Developed Selections for High Nodulation And Value of Nodulation Variants of Chickpea. In: Proceedings of an International Workshop on Managing Legume Nitrogen Fixation in the Cropping Systems of Asia, 20-24 Aug 1996, ICRISAT, India.
Singh, Onkar and Rupela, O P (1997) Genetics of nonnodulation in the new nonnodulating selection of chickpea. In: Proceedings of an International Workshop on Managing Legume Nitrogen Fixation in the Cropping Systems of Asia, 20-24 Aug 1996, ICRISAT, India.
Rupela, O P and Khurana, A L (1997) Limitations and potentials in improving biological nitrogen fixation of pulses: A critical assessment. In: Recent Advances in Pulses Research. Indian Soceity of Pulses Research and Development, Kanpur, pp. 525-542.
Dudeja, S S and Potdukhe, S R and Narndeo, S L and Datar, V V and Kumar, V and Tilak, K V B R and Khurana, A L and Rupela, O P (1997) Multilocational Evaluation of Some Selected Chickpea Nodulation Variants in India. 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.
Rupela, O P (1997) Nitrogen fixation research through cooperation. 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.
Sidhu, B S and Rupela, O P and Gopalakrishnan, S and Beri, V (1997) Searching Alternatives To Burning Rice Straw. In: Prceedings of the Third Agricultural Science Congress, March 12-15, 1997, PAU, Ludhiana, India.
Sidhu, B S and Rupela, O P and Gopalakrishnan, S and Beri, V (1997) Searching Alternatives to burning rice straw. In: Third Agricultural Science congress Punjab Agricultural University , 12-15 March 1997, Ludhiana, Punjab.
Wani, S P and Rupela, O P and Lee, K K (1997) Soil Mineral Nitrogen Concentration and Its influence on Biological Nitrogen Fixation of Grain Legumes. In: International Workshop on Manging Legumes Nitrogen Fixation in The Cropping System of Asia, 20-24 August 1996, ICRISAT Asia Centre, Patancheru, Andhra Pradesh.
Saraf, C S and Rupela, O P and Hegde, D M and et al, . (1998) Biological nitrogen fixation and residual effects of winter grain legumes in rice and wheat cropping systems of the Indo-Gangetic Plain. In: Residual effects of legumes in rice and wheat cropping systems of the Indo-Gangetic plain. Oxford & IBH Publishing Co. Pvt. Ltd., New Delhi, pp. 14-30. ISBN 81-204-1297-4
Rupela, O P and Sharma, L C and Danso, S K A (1998) Evaluation of N2 fixation by nodulation-variants of chickpea in India. Documentation. International Atomic Energy Agency, Vienna, Austria.
Rao, J V D K K and Rupela, O P (1998) Factors affecting biological nitrogen fixation and residual effects of legumes in the Indo-Gangetic Plain. In: Residual Effects of Legumes in Rice and Wheat Cropping Systems of the Indo-Gangetic Plain. Oxford & IBH Publishing Co. Pvt. Ltd., New Delhi, pp. 82-104. ISBN 81-204-1297-4
Singh, Onkar and Rupela, O P (1998) A New Gene that Controls Root Nodulation in Chickpea. Crop Science, 38 (2). pp. 360-362.
Rupela, O P and Sidhu, B S and Gopalakrishnan, S and Saini, S K and Beri, V (1998) Preparation and evaluation of Rice-Straw Compost. In: 2nd Research Co-ordination meeting of the FAO/IAEA Co-ordinated Research Project on “The use of nuclear techniques in the management of organic matters to enhance soil productivity and crop yields”, 20-24 April 1998 , Vienna, Austria.
Rupela, O P and Rao, G V R and Rahman, S J and Wani, S P and Gowda, C L L (1998) Promoting biopesticides for crop protection through partnerships-an on-going drive. In: National Workshop on Promotion of Bio-pesticides and Bio-fertilizers in Agriculture, 20-22 September 2005, Rajendranagar, Hyderabad, India.
Sharma, S B and Rupela, O P and Ansari, M A and Gopalakrishnan, S (1998) Suppression of Meloidogyne Javanica egg hatch by an isolate of Pseudomonas striata. In: III International Symposium of Afro-Asian Society of Nematologists , 16-19 April 1998, Coimbatore, India.
Sidhu, B S and Rupela, O P and Beri, V and Joshi, P K (1998) Sustainability implications of burning rice- and wheat-straw in Punjab. Economic and Political Weekly, 33 (39). 163A-168A. ISSN 0012-9976
Khanam, D and Bhuiyan, M A H and Hossain, A K M and Rupela, O P (1999) Evaluation of selected chickpea nodulation variants in Bangladesh. Bangladesh Agronomy Journal, 9 (1-2). pp. 51-56. ISSN 1013-1922
Rupela, O P and Gopalakrishnan, S (1999) Two Rich Sources bacteria anatagonistic to fusarium solani. In: International Workshop titled Tropical Soil, biology: opportunities and challenge for African agriculture , 14-23 March 1999, Nairobi, Kenya.
Yoneyama, T and Engelaar, W M H G and Kim, H Y and Rupela, O P (2001) δ15N values of sorghum grains harvested on a Vertisol in the semi-arid tropics were positively related to doses of fertilizer N but negatively with the frequency of legume cultivation. Soil Science and Plant Nutrition, 47 (2). pp. 423-427. ISSN 0038-0768
Gowda, C L L and Ramakrishna, A and Rupela, O P and Wani, S P (2001) Priorities for Research and Development of Legumes in Tropical Rice-based Cropping Systems of Asia. In: Proceedings of the workshop on “Legumes in Rice-based Cropping Systems in Tropical Asia Constraints and Opportunities”, Jan 1999, ICRISAT Patancheru, India.
Ansari, M A and Rupela, O P and Douaik, A and Gopalakrishnan, S and Sharma, S B (2002) Effect of culture filtrates of Pseudomonas striata, Trichoderma harzianum, T. viride and Aspergillus awamori on egg hatch of Meloidogyne javanica. International Journal of Nematology, 12 (2). pp. 131-136. ISSN 1368-8774
Rupela, O P and Wani, S P and Rego, T J (2002) Managing and harnessing soil flora/fauna biodiversity for sustainable crop production in the semi-arid tropics. In: Beyond the gene horizon: sustaining agricultural productivity and enhancing livelihoods through optimization of crop and crop-associated biodiversity with emphasis on semi-arid tropical agroecosystems. Proceedings of a workshop, 23-25 September 2002, Patancheru, India.
Ali, M Y and Krishnamurthy, L and Saxena, N P and Rupela, O P and Kumar, J and Johansen, C (2002) Scope for genetic manipulation of mineral acquisition in chickpea. Plant and Soil, 245 (1). pp. 123-134.
Rupela, O P and Gopalakrishnan, S and Sidhu, B S and Beri, V (2003) Composting Rice Straw in Semi-Arid Conditions. In: Management of crop residues for sustainable crop production: Results of a co-ordinated research project organized by the Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture 1996–2001. International Atomic Energy Agency, Vienna, Austria, pp. 171-178. ISBN 92–0–104203–5
Gowda, C L L and Ramakrishna, A and Rupela, O P (2003) Sustainable crop production in developing countries: a daunting challenge ahead. Financing Agriculture, 35 (2). pp. 3-8.
Rupela, O P and Gopalakrishnan, S and Krajewski, M and Sriveni, M (2003) A novel method for the identification and enumeration of microorganisms with potential for suppressing fungal plant pathogens. Biology and Fertility of Soils, 39. pp. 131-134.
Serraj, R and Gyamfi, J A and Rupela, O P and Drevon, J J (2004) Improvement of legume productivity and role of symbiotic nitrogen fixation in cropping systems: Overcoming the physiological and agronomic limitations. In: Symbiotic Nitrogen Fixation Prospects for Enhanced Applicationin Tropical Agriculture. Oxford and IBH Publishing Co. Pvt. Ltd., New Delhi, pp. 67-97. ISBN 8120416147
Sriveni, M and Rupela, O P and Gopalakrishnan, S and Krajewski, M (2004) Spore-forming bacteria, a major group among potential antagonists isolated from natural sources such as termitaria soil and composts used by organic farmers. Indian Journal of Microbiology, 44 (2). pp. 95-100. ISSN 0046-8991
Grzywacz, D and Richards, A and Rabindra, R J and Saxena, H and Rupela, O P (2005) Efficacy of biopesticides and natural plant products for Heliothis/Helicoverpa control. In: Heliothis/Helicoverpa management: emerging trends and strategies for future research. Oxford & IBH Publishing Co. Pvt. Ltd., New Delhi, pp. 371-389. ISBN 81-204-1650-3
Kang, G S and Beri, V and Sidhu, B S and Rupela, O P (2005) A new index to assess soil quality and sustainability of wheat-based cropping systems. Biology and Fertility of Soils, 41 (6). pp. 389-398. ISSN 0178-2762
Hameeda, B and Rupela, O P and Reddy, G (2006) Antagonistic activity of bacteria inhabiting composts against soil-borne plant pathogenic fungi. Indian Journal of Microbiology, 46 (4). pp. 389-396. ISSN 0046-8991
Hameeda, B and Rupela, O P and Reddy, G and Satyavani, K (2006) Application of plant growth-promoting bacteria associated with composts and macrofauna for growth promotion of Pearl millet (Pennisetum glaucum L.). Biology and Fertility of Soils, 43 (2). pp. 221-227.
Hameeda, B and Reddy, Y H K and Rupela, O P and Kumar, G N and Reddy, G (2006) Effect of Carbon Substrates on Rock Phosphate Solubilization by Bacteria from Composts and Macrofauna. Current Microbiology, 53 (4). pp. 298-302. ISSN 0343-8651
Rupela, O P and Gowda, C L L and Wani, S P and Hameeda, B (2006) Evaluation of crop production systems based on locally available biological inputs. In: Biological approaches to sustainable soil systemes. CRC Press, Baca Raton, Florida, USA, 501-515 . ISBN 9781574445831
Hameeda, B and Rupela, O P and Wani, S P and Reddy, G (2006) Indices to Assess Quality, Productivity and Sustainable Health of Soils Receiving Low Cost Biological and/or Conventional Inputs. International Journal of Soil Science, 1 (3). pp. 196-206. ISSN 1816-4978.
Ranga Rao, G V and Rupela, O P and Wani, S P and Rahman, S J and Jyothsna, J S and Rameshwar Rao, V and Humayun, P (2007) Bio-intensive pest management reduces pesticide use in India. Pesticides News , 76. pp. 16-17.
Ranga Rao, G V and Rupela, O P and Rao, V R and Reddy, Y V R (2007) Role of biopesticides in crop protection: present status and future prospects. Indian Journal of Plant Protection, 35 (1). pp. 1-9.
Hameeda, B and Harini, G and Rupela, O P and Wani, S P and Reddy, G (2008) Growth promotion of maize by phosphate-solubilizing bacteria isolated from composts and macrofauna. Microbiological Research, 163 (2). pp. 234-242. ISSN 0944-5013
Kiran, B K and Gopalakrishnan, S and Rupela, O P and Humayun, P and Reddy, G (2009) Accessing Actinomycetes from Herbal Verniicomposts and their Evaluation for PGPTraits. In: Plant Growth Promotion by Rhizobacteria for Sustainable Agriculture. Acharya NG Ranga Agricultural University (ANGRAU), Hyderabad, pp. 569-575. ISBN 8172336608
Gopalakrishnan, S and Rupela, O P and Humayun, P and Kiran, B K and Sailasree, J and Alekhya, G and Sandeep, D (2009) Bio-active Secondary Metabolities from PGPR and Botanicals. In: Plant Growth Promotion by Rhizobacteria for Sustainable Agriculture. Acharya N.G. Ranga Agricultural University (ANGRAU), Hyderabad, pp. 45-51. ISBN 8172336608
Gopalakrishnan, S and Rupela, O P and Ranga Rao, G V and et al, . (2009) Biological options for crop pest and disease management and bioproducts research consortium-sanguine to sustainable agriculture. In: 6th International conference on Biopesticides: stakeholders’ perspectives , 26-30 Apr 2009, New Delhi, India.
Ranga Rao, G V and Desai, S and Rupela, O P and Krishnappa, K and Wani, S P (2009) Integrated Pest Management Options for Better Crop Production. In: Best-bet Options for Integrated Watershed Management Proceedings of the Comprehensive Assessment of Watershed Programs in India, 25-27 July 2007, ICRISAT Patancheru, Andhra Pradesh,India.
Gopalakrishnan, S and Kiran, B K and Humayun, P and Vidya, M. S. and Deepthi, K and Jacob, S and Vadlamudi, S and Alekhya, G and Rupela, O P (2011) Biocontrol of charcoal-rot of sorghum by actinomycetes isolated from herbal vermicompost. African Journal of Biotechnology, 10 (79). pp. 18142-18152. ISSN 1684-5315
Gopalakrishnan, S and Rao, G V R and Humayun, P and Rao, V R and Alekhya, G and Jacob, S and Deepthi, K and Sree Vidya, M and Srinivas, V and Mamatha, L and Rupela, O P (2011) Efficacy of botanical extracts and entomopathogens on control of Helicoverpa armigera and Spodoptera litura. African Journal of Biotechnology, 10 (73). pp. 16667-16673. ISSN 1684-5315
Gopalakrishnan, S and Ranga Rao, G V and Humayun, P and Alekhya, G and Vidya, M S and Simi, J and Srinivas, V and Ratna Kumari, B and Vijayabharathi, R and Seema, M and Singh, A and Rupela, O P (2014) Biological options for crop health (Nutrition, pest and disease) management-sanguine to sustainable agriculture. In: Trends in Soil Microbial Ecology. Studium Press LLC, New Delhi, pp. 321-336. ISBN 1-626990-36-0