Int.J.Curr.Microbiol.App.Sci (2020) 9(10): 1405-1412 1405 Original Research Article https://doi.org/10.20546/ijcmas.2020.910.167 Evaluation of Brown Coloured Cotton Genotypes by Genetic Studies (Gossypium hirsutum L.) G. Geetha Devi 1* , J. M. Nidagundi 1 , J. R. Diwan 1 , K. Mahanthashivyogayya 1 and S. G. Hanchinal 2 1 Department of Genetics and Plant Breeding, University of Agricultural Sciences, Raichur-584104, Karnataka 2 Department of Entomology, University of Agricultural Sciences, Raichur - 584 104, Karnataka *Corresponding author ABSTRACT Introduction Cotton (Gossypium hirsutum L.) referred as “White gold” is a premier cash and fibre crop cotton, the world’s most important non-food agricultural commodity used for textile purpose, is an important commercial crop grown all over the world which is mainly grown for its fibre. It is a soft, staple fibre that grows around the seed of cotton plant and some writers fabricated stories of lamb sitting inside the fruit. The lint colour of cotton under commercial cultivation is often white. In the cultivated species, brown and green colours are most common. Some of the genotypes in germplasm collection of USA International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 9 Number 10 (2020) Journal homepage: http://www.ijcmas.com The present study was conducted on genetic variability, correlation coefficient analysis for seed cotton yield and its component traits in 18 brown coloured cotton genotypes collected from CICR, Nagpur, which was carried out during kharif2018 at the Main Agricultural Research Station, UAS, Raichur, Karnataka. Observations on traits viz., plant height at harvest, number of sympodia, number of monopodia, sympodial length at ground level, sympodial length at 50% plant height, number of bolls per plant, lint index, boll weight, internodal distance, seed index, seed cotton yield per plant, ginning out turn, fibre length, fibre strength and micronaire were recorded. The results showed that highest GCV for number of monopoodia per plant and sympodial length at 50% plant height. Highest heritability was observed for number of sympodia, plant height, fibre length ginning out turn and seed index. Plant height at harvest, number of monopodia per plant, number of sympodia per plant, sympodial length at ground level, intermodal distance were positively correlated with seed cotton yield and the traits viz., seed index and fibre length exhibited negative correlation. Keywords Genetic variability, Heritability, GCV, PCV, Genetic advance, Correlation and Seed cotton yield Accepted: 12 September 2020 Available Online: 10 October 2020 Article Info