Abstract

                                Coordinated varietal trials were conducted during 1970-71 and 1971-72, under the All India Coordinated Cotton Improvement Project. using improved strains of G. hirstum, G. arboreum and G. barbadense, in Northern. Central and Southern Zones. under irrigated and rainfed conditions. For the yield character, Variety x Env. linaar' and 'Pooled deviations' effects were significent for G. hirsutum (irrigated) varieties in Central Zone whereas the former effect alone was significant in Southern Zone. For G. arboreum and G. hirsutum (rainfed) varieties, and for G. barbadense (irrigated) varieties the interaction i.e.. Variety x Env. linear' effect was significant, while Pooled deviations' effect was not significant. Under G. hirsutum (irrigated) group. J 205 and J 127 varieties from Northern Zone, 66 BH 5/55' and 'DHY-82' varieties from Central Zone. 'MCU 5'. 'ELS 117' and 'A 179' varieties from Southern Zone, and under G. arboreum (rainfed) group CJ 2164 and AKH 2 varieties, and under G. barbadense (irrigated) 'N 28 and ERB 4488 varieties from Central and Southern Zones were found more stable in the respective Zones.

Key words :