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Singh, Onkar and Rupela, O P (1998) A New Gene that Controls Root Nodulation in Chickpea. Crop Science, 38 (2). pp. 360-362.
Kumar, S and Singh, Onkar and Rheenen, H A van and Rao, K V S (1998) Repeatability of different stability parameters for grain yield in chickpea. Plant Breeding, 117 (2). pp. 143-146. ISSN 1439-0523
Kumar, Shiv and Singh, Onkar and Rheenen, H A van and Rao, K V S (1997) Correlations among different stability parameters for grain yield in chickpea. Indian Journal of Genetics and Plant Breeding, 57 (4). pp. 439-446. ISSN 0019-5200
Singh, Onkar and Sethi, S C and Lateef, S S and Gowda, C L L (1997) Registration of ICCV 7 Chickpea Germplasm. Crop Science, 37 (1). p. 295. ISSN 1435-0653
Kumar, S and Singh, Onkar (1995) Inheritance of seed size in chickpea. Journal of Genetics and Breeding, 49 (2). pp. 99-103.
Gowda, C L L and Singh, Onkar and Sethi, S C and Singh, K B and Rao, B V and Rahman, M M and Kumar, J and Rahman, M A (1995) Registration of ‘ICCV 10’ Chickpea. Crop Science, 35 (2). p. 589. ISSN 1435-0653
Singh, Onkar and Han, T and Moe, K and Sein, K and Shwe, A and Than, A M and Hlaing, C W (1994) New Chickpea Varieties for Myanmar. International Chickpea Newsletter, 1. pp. 9-11. ISSN 0257-2508
Singh, Onkar and Gowda, C L L and Sethi, S C and Dasgupta, T and Kumar, J and Smithson, J B (1993) Genetic analysis of agronomic characters in chickpea. II. Estimates of genetic variances from line × tester mating designs. TAG Theoretical and Applied Genetics, 85 (8). pp. 1010-1016. ISSN 1432-2242
Sharma, S B and Singh, Onkar and Pundir, R P S and McDonald, D (1993) Screening of Cicer Species and Chickpea Genotypes for Resistance to Meloidogyne Javanica. Nematologia Mediterranea, 21 (2). pp. 165-167.
Singh, Onkar and Gowda, C L L and Sethi, S C and Dasgupta, T and Smithson, J B (1992) Genetic analysis of agronomic characters in chickpea. I. Estimates of genetic variances from diallel mating designs. TAG Theoretical and Applied Genetics, 83 (8). pp. 956-962. ISSN 1432-2242
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.
Singh, Onkar and Singh, K B and Jain, K C and Sethi, S C and Kumar, J and Gowda, C L L and Haware, M P and Smithson, J B (1991) Registration of ‘ICCV 6’ Chickpea. Crop Science, 31 (5). p. 1379. ISSN 1435-0653
Geletu, Bejiga and Rheenen, H A van and Jagadish, C A and Singh, Onkar (1991) Relationships among the F2 to F6 generations in chickpea (Cicer arietinum L.). Indian Journal of Genetics and Plant Breeding, 51 (2). pp. 240-245. ISSN 0019-5200
Singh, Onkar and Haware, M P (1990) Occurrence of chickpea foot rot disease in Rajasthan, India. International Chickpea Newsletter, 22. pp. 38-39.
Sharma , S B and Saha, R P and Singh, Onkar and Rheenen, H A van (1990) Root-knot nematode disease of chickpea in Nepal. Tropical Pest Management, 36 (4). pp. 327-328. ISSN 0143-6147
Karki, P B and Tiwari, K R and Singh, Onkar and Bharati, M P (1989) Effect of Sowing Date on the Incidence of Botrytis Gray Mold in Chickpea. International Chickpea Newsletter, 21. pp. 21-23.
Manandhar, H K and Sharma, S B and Singh, Onkar (1989) Field screening of chickpea genotypes for resistance to the root-knot disease caused by Meloidogyne spp in Nepal. International Chickpea Newsletter, 20. p. 14.
Reddy, M V and Singh, Onkar and Bharati, M P and Sah, R P and Joshi, S (1988) Botrytis Gray Mold Epiphytotic of Chickpea in Nepal. International Chickpea Newsletter, 19. p. 15.
Singh, Onkar and Smithson, J B (1986) Assessment of F2-derived lines as a breeding procedure in chickpea. International Chickpea Newsletter, 15. pp. 2-4.
Singh, Onkar and Rupela, O P and Rheenen, H A van (1986) Genetics of nonnodulation in chickpea. International Chickpea Newsletter, 15. pp. 5-6.
Gowda, C L L and Singh, Onkar (1986) Inheritance of an upright pedicel mutant characteristic in chickpea. International Chickpea Newsletter, 15. pp. 8-9.
Singh, Onkar and Singh, K B and Sethi, S C and Jain, K C and Gowda, C L L and Kumar, J and Smithson, J B (1986) Registration of ICCV 1 Chickpea. Crop Science, 26 (5). pp. 1081-1082. ISSN 1435-0653
Singh, Onkar and Gowda, C L L and Sastry, P V S S (1986) Variation in the proportion of double-podded nodes among advanced generation progenies in chickpea - some preliminary observations. International Chickpea Newsletter, 15. pp. 4-5.
Singh, Onkar and Smithson, J B and Gowda, C L L (1983) P-1329 - a superior chickpea cultivar adapted to early sowing in peninsular India. International Chickpea Newsletter, 9. pp. 8-9.
Singh, K B and Singh, Onkar and Sethi, S C and Gowda, C L L and Kumar, J (1977) Chickpea Breeding. Monograph. ICRISAT, Patancheru, Andhra Pradesh, 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.
Bijiga, G (1987) Relationships among the F2 to F6 generations, and effect of spacing and selection in F4 on performance in F5 generation in chickpea. PHD thesis, Andhra Pradesh Agricultural University.