Rajakumar,All India Co ordinated Cotton Improvement Project |
Nidagundi J.M.,All India Co ordinated Cotton Improvement Project |
Konda C.R.,All India Co ordinated Cotton Improvement Project |
Ajayakumar M.Y.,All India Co ordinated Cotton Improvement Project |
Lokesha R.,All India Co ordinated Cotton Improvement Project
Research on Crops | Year: 2012
A study was conducted with an objective to determine genotype × environment (G x E) interaction and stability parameters of 20 commercially available Bt cotton hybrids over three environments viz., Agricultural Research Station, Siruguppa (E-l), Main Agricultural Research' Station, Raichur (E-2) and Agricultural Research Station, Bheemarayanagudi (E-3). Stability parameters including mean, linear regression coefficient (bi) and deviations from regression (S2di) were arrived at following standard procedures. Significant differences for yield were observed in all the three environments. Mean seed cotton yield ranged from 1478 to 2203 kg/ha with genotypes showing significant interaction with environment. Regression coefficients ranged from 0.19 to 1.70 with deviation from regression being significant for all the hybrids evaluated except Tulasi-4BG-II, Tulasi-117 BG-II, Chirutha BG-II, ACH-155-2 BG-II, Rakhi-621 BG-II and RCH-2 BG-II. The study revealed that three hybrids viz., MRC-7347 BG-II, ACH-177-2 BG-II and MRC-7351 BG-II exhibited better stability not only with respect to seed cotton yield but also fibre qualities, particularly span length and fibre strength.