الفهرس 
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Abstract
This study was carried out at Plant Production Department Laboratories, Faculty of Agriculture (Saba-Basha), Alexandria University and Cotton Arbitration and Testing General Organization (CATGO) Egypt, on some cotton varieties and some drying instruments, during 2018/2019 season.
The aim of the present investigation is to estimate the percentage of absorbed moisture content and relative humidity of commercial cotton samples in the approved devices by (CATGO), and determination of the most suitable devices and most suitable measurements for the moisture of Egyptian cotton.
Six commercial Egyptian cotton varieties representing the two categories of Egyptian cotton were used. The first group represents the Extra-long staple, extra fine (ELS) category these varieties were Giza 87 and Giza 96 (over 1 3/8-inch fiber length = > 35 mm).
The second group represented the long staple (LS) category (1 1/4 -1 3/8-inch fiber length =30:34 mm) included long staple white i.e., Giza 86, Giza 94 and Long staple creamy i.e., Giza 95 and Giza 90.
This investigation was conducted in a completely randomized design with three replicates and analyzed as a factorial experiment according to the technique of analysis of variance (ANOVA) (Gomez and Gomez, 1984). The data was computed using the Co-Stat program version 6.400, to test differences among studied mean of treatments, the least significant difference (L.S.D.) was used at 0.05 level of probability.