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This study was carried out at Plant Production Department, Faculty of Agriculture (Saba Basha), Alexandria University, Egypt, during 2016/2017 season to investigate the effect of conditioning temperature degrees and lint grades on cotton fiber properties of two long staple varieties. Three lint cotton grades; namely, Good to Fully Good (G/FG), Good (G) and Fully Good Fair to Good (FGF/G) belong to Egyptian long staple cotton varieties; Giza 86 and Giza 94 were used. Four conditioning temperature degrees were used; i.e., 21 C, 23 C, 25 C and 27 C. Results showed that Good to Fully Good (G/FG) cotton grade surpassed the other two cotton grades and gave the highest mean values of spinning consistency index (SCI), length uniformity index (%), fiber bundle strength, maturity index (%), micronaire reading and fiber reflectance degree (Rd %). Conversely, this grade registered the lowest values for short fiber index (%), yellowness degree (+b), trash count and trash area (%). Upper half mean length, spinning consistency index, fiber bundle strength, fiber elongation (%) and micronaire reading were the highest with temperature degree 21 C, but this temperature degree produced the lowest mean value of short fiber index. The highest mean values for length uniformity index, short fiber index, fiber bundle strength, maturity index and micronaire reading were registered for Giza 86 cotton variety as compared to Giza 94 cotton variety. Best fiber quality properties over all studied cotton varieties and grades were achieved at 21C conditioning temperature.

Response of Fiber Quality to Temperature Degree and Lint Cotton Grade in Two Long Staple Varieties