RELATIONSHIP BETWEEN COTTON-SEED SITE INSIDE BOLL WITH SEED AND FIBER CHARACTERSUNDER SOME LOCATIONS OF TWO EGYPTIAN COTTON CULTIVARS

摘要

Two commercial Egyptian cotton cultivars used in this study namely ; Giza 70 and Giza 75. Seed cotton samples of the studiedcultivars were taken from 13 locations in Egypt, during the two successive seasons 1995 and 1996. 50 bolls of seed cotton ofeach replicate were picked, every loculi of each boll was divided to three parts i.e., top, middle and base to study germinationpercentage, lint cotton %, seed index, fiber length parameters, micronaire reading and fiber colour. The base site gave thehighest values of germination percentage, lint percentage, seed index, micronaire reading and degree of reflectance (Rd %).Whereas, the middle site recorded the highest the 2.5 % and 50 % span lengths. The top site recorded the second or third orderof the all characters under study. The results indicated that micronaire reading showed highly significant positive correlationwith germination percentage, lint percentage and Rd %, and it showed significant positive correlation with seed index.