الفهرس 
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Abstract
The present investigation was conducted in the Plant Production Department, Faculty of Agriculture (Saba Basha), Alexandria University to investigate the effect of cotton variety, seed cotton grade and their interaction on ginning efficiency and fiber properties.
Four commercial Egyptian cotton varieties namely: Giza 87 and Giza 92 (belong to extra-long staple length), Giza 86 and Giza 94 (belong to long staple length) were used in this study through 2016 season. Four seed cotton grades namely: good/ fully good, (G/FG); good (G); fully good fair/good, (FGF/G) and fully good fair, (FGF) in three replicates were collected for each cotton variety.
Seed-cotton grade samples were ginned at Al Delta ginning Mill, Desouk Kafr El-Sheikh Governorate using conventional roller gin stand (McCarthy).
The seed grid adjustment; i.e., 1.25, 1.00, 1.00 and 0.75 lineal were used when ginning the seed cotton grades i.e., (G/FG), (G), (FGF/G) and (FGF), respectively of the Extra-Long Staple varieties (Giza 87 and Giza 92). While, the seed grid adjustment; i.e., 1.50, 1.25, 1.25 and 1.00 lineal were used when ginning the same seed cotton grades, respectively of the Extra-Long Staple varieties (Giza 86 and Giza 94).
The studied characters:
5.1. Ginning efficiency parameters
5.1.1. Gin stand capacity (kg/inch/hr):
5.1.2. Ginning time (hr/kentar):
5.1.3. Lint cotton (%):
5.1.4. Lint cotton grade:
5.2. H.V.I. Fiber Properties:
5.3. Shirley Analyzer characteristics:
5.3.1. Lint content (%)
5.3.2. Non-lint cotton content (%).