الفهرس 
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Abstract
This study was carried out at Plant Production Department, Faculty of Agriculture (Saba Basha), Alexandria University, Egypt, during 2016/2017 season. The main objective of this manuscript was to investigate the effect of the cotton variety, lint grade and their interaction on the H.V.I. fiber properties. Besides, the association between the classer’s grade (C.G.) and both instrumental grade (I.G.), fiber quality index (F.Q.I) and modified fiber quality index (m.F.Q.I.). As well as calculating the contribution percentage of the HVI fiber properties to the classer and instrumental grades to be utilized in predicting those grades for the studied cotton varieties.
Three commercial Egyptian cotton varieties, representing the two length groups, Giza 96, Giza 90 and Giza 94 were involved in the present study. Five lint grades, namely: Good to Fully Good (G/FG), Good +1/4 (G +1/4), Good (G), Good-1/4 (G -1/4) and Fully Good Fair to Good (FGF/G) of each cotton variety were used.
Cotton samples were attained from the International Cotton Training Center (ICTC), Cotton Arbitration and Testing General Organization (CATGO), Smouha, Alexandria, Egypt.
Fiber properties were determined by the High Volume Instrument (H.V.I.) 1000 system following the standard procedure of at the laboratories of the Cotton Arbitration and Testing General Organization (CATGO), Alexandria, Egypt. Samples were preconditioned for 48 hours at least under the standard conditions of 65% ± 2% relative humidity and 20 ± 1ºC temperature before testing.