COMPARATIVE EVALUATION OF PROMISING HYBRID GIZA 84 X (GIZA 74 X GIZA 68) AND EXTRA-LONG STAPLE COTTON VARIETIES GROWN IN NORTH DELTA

Promising hybrid cotton Giza 84 x (Giza 74 x Giza 68) and four commercial varieties i.e.: Giza 45, Gin 70, Giza 87 and Giza 88 were evaluated at six environments In North Delta. Randomized complete block design was used. Nine characters were studied. Significant differ­ences between genotypes for all studied characters except 50% span length and Presly index. The new hybrid Giza 84 x (G. 74 x G. 68) pro­duced the highest overall seed cotton yield, surpassed Giza 45 and Gin 87 in lint percentage and boll weight and on Giza 88 in length uniformity ratio. El-Beheira region surpassed the two other locations in all studied characters except Pressley index which was insignificant and length uni­formity ratio. The effects of the growing year, Interactions between gen­otypes x seasons and location x season were significant on most studied characters butt the effect of the second order interaction was signifi­cant on seed index and lint percentage only. Positive significant correlations were found between seed cotton yield, boll weight, seed index, lint percentage and micronaire reading. Also, between 2.5% span length, boll weight, seed index and micronaire reading and between 50%, 2.5% span length and length uniformity ratio. It can be recommendation by sowing Giza 84 x (G.74 x G. 68) hybrid from the extra long staple cotton category at North Delta, Giza 70 at El­Beheira, Giza 88 at both El-Beheira and Kafr EI-Sheikh and concluded that this hybrid may be used for the improvement the Extra long staple cotton category of seed cotton yield, while Giza 88 was the best for the Improvement of boll weight, seed Index lint percentage and 2.5% span length. Also Giza 87 to improvement of fineness.