EVALUATION AND GENOTYPIC STABILITY FOR THE HYBRID (GIZA 89 X GIZA 86) AND SOME EGYPTIAN LONG STAPLE COTTON VARIETIES

The present investigation aimed to determine evaluation and gen­otypic stability for some Egyptian long staple cotton genotypes i.e.:­promising hybrid (Giza 89 x Giza 86) and three varieties i.e.:- Giza 85, Giza 86 and Giza 89 under twelve different environments. Each single carried trial was grown in a randomized complete block design with four replications. Nine characters were studied. All characters showed highly significant mean squares for environments and genotype x environment interaction> All characters except seed cotton yield k/f showed highly significant mean squares for genotypes. The new hybrid (Giza 89 x Giza 86) surpassed Giza 89 in all stud­ied characters, on Giza 85 except lint percentage and on Giza 86 seed cotton yield, lint percentage and 2.5% span length at most studied envi­ronments. Giza 86 gave the highest lint percentage and 2.5% S.L. more than the other genotypes it surpassed Giza 85 in all studied characters except S.C.Y. and seed index an on Giza 89 in all studied characters ex­cept S.C.Y. Giza 85 surpassed Giza 89 for seed index while Giza 89 sur­passed Giza 85 in (2.5% and 50%) S.L. Average genotypic stability degrees were recorded for seed cot­ton yield k/f for Giza 85; boll weight for Giza 89; seed index for Giza 86 and Giza 89; lint percentage for Giza 86; 2.5% S.L. for (Giza 89 x Giza 86) hybrid; 50% S.L. for Giza 86; L.U.R. for Giza 85 and Giza 86, while all genotypes under study were unstable for micronaire reading and yarn strength. It can be recommended by sowing Giza 86 at Kafr EI-Sheikh and sowing (Giza 89 x Giza 86) hybrid as an alternate of Giza 85 and Giza 89 at the other studied regions.