The present investigation was carried out at the Experimental Farm of the Faculty of Agriculture at Fayoum, Cario University at Dalla, Fayoum Governorate during the two seasons 2000/2001 and 2001/2002. The aim of this investigation was to study the effect of organic manure and number of berseem cuts on cotton yield and its components and fiber traits. The obtained results indicate that only plant height at harvest, number of fruiting branches / plant and the height of the 1^st fruiting branch were significantly affected by organic manure (O.M.) application. On the other hand, organic manure did not affect significantly the seed cotton yield, yield components and fiber quality traits. Cotton planting dates affected significantly all studied vegetative growth, seed cotton yield, yield components and fiber quality traits. Early planting date (1^st week of March) showed significant superiority over the other two planting dates (1^st week of April & May) in number of fruiting branches/ plant, number of days to 1^st flower appearance and 1^st boll opening, number and weight of open bolls/ plant in the 1^st& 2^nd pickings, seed cotton yield, lint percentages and studied fiber quality traits.
The decreases in the total seed cotton yield attributed to the late planting dates (1^st week of April & May) amounted 26.4 and 84.8% and 30.6 and 84.1% of  March planting with the treatments of 10 and 20 m³/ fad organic manure, respectively.