الفهرس 
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Abstract
The present investigation was conducted at Plant Production Department, Faculty of Agriculture (Saba Basha), Alexandria University, Egypt, during 2017 season. The experimental work was done at Cotton Arbitration for Testing General Organization (CATGO), Alexandria Governorate by using three commercial Egyptian cotton varieties (G. barbadense L.), namely; Giza 86, Giza 94 and Giza 95 (long staple cotton). Three lint cotton grades namely: Good to Fully Good (G/FG), Good (G) and Fully Good Fair to Good (FGF/G) from each variety, were used. This investigation aimed to study the response of cotton fiber quality to cotton variety and lint cotton grade and conditioning temperature degree of 21, 23, 25 and 27 OC.
The obtained result could be summarized as follows:
5.1. HVI length characters:
• Cotton variety Giza 94 gave the higher value (33.39mm) of upper half mean length (UHM). Whereas, the cotton variety Giza 95 gave the lowest one (27.65mm) of the same character.
• Increasing lint cotton grade up to Good to Fully Good increased upper half mean length followed by Good which had significant difference between the higher grades in comparison with Fully Good Fair to Good.
• Temperature degrees had insignificant effect on the upper half mean length.
• The highest mean values of upper half mean length (mm) were obtained with cotton variety Giza 94 combined with lint cotton grade Good to Fully Good.
• The highest upper half mean length (34.08 mm) was recorded from cotton variety Giza 94 with higher lint cotton grade (G/FG) that conditioned at 21OC.
• The cotton variety Giza 86 had higher value of length uniformity index (86.88%), while the cotton variety Giza 95 gave the lowest ones (82.39%) of the same trait.
• Increasing lint cotton grades up to Good to Fully Good significantly increased length uniformity index (%) followed by the lint cotton grade Good which had significant difference between the higher grade in comparison with Fully Good Fair to Good which produced the lowest values of the same trait.
• Length uniformity index (%) was insignificantly affected by conditioning temperature degree due to varietal difference.
• The highest length uniformity index (87.09%) was reached when cotton variety Giza 86 was tested at 23OC. In the contrast, the lowest length uniformity index (81.85%) resulted from conditioning cotton variety Giza 95 at the same conditioning temperature degree.
• The highest uniformity index (87.95%) was attained from Giza 86 cultivar for high lint cotton grade (G/FG) at conditioned 21OC. On the other hand, the lowest uniformity index (81.31%) was recorded from the lowest lint cotton grade (G) of the cotton variety Giza 95 conditioned at 23 OC.
• The cotton variety Giza 95 recorded higher value of short fiber index (%) followed by cotton variety Giza 86 as compared with the lowest cotton variety Giza 94 which gave the lowest ones of the same trait.
• Increasing lint cotton grades up to Fully Good Fair to Good significantly increased short fiber index (%) followed by the lint cotton grade Good which had significant difference between the higher grade in comparison with Good to Fully Good which produced the lowest value of the same trait.