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EVALUATION AND STABILITY OF SOME EGYPTIAN COTTON VARIETIES UNDER NORMAL AND LATE SOWING CONDITIONS

: The objective of this study was to determine the effect of sowing dates on cotton yield, its components and fiber quality characters and select the favorable variety for delaying sowing. Cotton growers face a problem of law cotton yield in late sowing (after clover or wheat) at Egypt. The present study was carried out to evaluate six varieties G. 86 , G.94 , G.95 , G.97 , G.92 and G.96 under normal and late sowing dates viz 15 th April and 15 th May during 2018 and 2019 at Sakha Agriculture Research Station in a randomized complete block design with four replications to study seed cotton yield , lint yield , boll weight , lint percentage, seed index , lint index , fiber length , length uniformity ratio , fiber strength and micronaire reading. All characters showed significant mean squares for varieties in normal and late combined analysis, except fiber strength and micronaire reading and in the combined analysis for normal and late sowing dates. Mean squares for sowing dates were significant for all characters, except fiber length and length uniformity ratio. The main cause of reduction in cotton yield due to that all the Egyptian cotton varieties were needed to grow under full season conditions. It is concluded that varieties G. 97 , G. 95 and G. 94 are response to late sowing date also, G. 96 is somewhat response tolerant but, it had few seed cotton yield to both sowing dates. Fiber quality characters over few affected by late sowing date. Varieties Giza 97, Giza 95 and Giza 94 are average stable and favorable to late sowing date for seed cotton yield according to (Eberhart and Russiell) and GGE- Biplot analyses.