Fourteen field experiments were conducted during the two successive seasons of 2014 and 2015 at seven different locations from the Northern Delta of Egypt i.e., (Kafr El-Sheikh, El-Beheira and Domietta) to Middle and Southern of the Delta of Egypt (El-Menoufia, Dakahlia, El-Gharbia and Sharkiea), to evaluates eight Egyptian cotton cultivars included two long stable genotypes; Giza 86 and Giza 94 and six extra–long staple; Giza 45, Giza 87, Giza 88, Giza 92, Giza 93 and Giza 96. Analysis of variance for randomized complete block design was done for each location. Then combined analyses of variance were calculated for 8 cultivars, seven locations over two seasons. The statistical analysis for phenotypic and genotypic stability was carried out according to the method described by Eberhart and Russell (1966) and Tai (1971) respectively.
With respect to Giza 86, Giza 87, Giza 88, Giza 92 and Giza 93 cultivars which considered as the most desired cultivars occupies the most areas cultivated by high production of seed cotton and lint cotton yields, However, Giza 96 had the widest range of environmental index for seed cotton yield and lint cotton yield. While, Giza 45 had the closet one for seed cotton yield and lint cotton yield.