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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 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 week of March) showed significant superiority over the other two planting dates (1 week of April & May) in number of fruiting branches/ plant, number of days to 1 flower appearance and 1 boll opening, number and weight of open bolls/ plant in the 1& 2 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 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 m/ fad organic manure, respectively. INTRODUCTION The crop rotation plays an important role in the system of crop husbandry for raising the crop production. In Egypt, it is well known that the most recommended cotton rotation is planting cotton after short season berseem as catch crop. Unfortunately, during the last two decades cotton planting date has been extended or delayed till May. This delay is mainly due to the shortage of forages which reflected on berseem price and make it more profitable to the farmers and encourage them to keep berseem to take more cuts and consequently delay cotton planting. The interrelationship between number of berseem cuts or other winter crops on cotton yield has been investigated by many workers. El-Moghazy et al (1984); Makram et al (1994); El-Debaby et al (1995 a & b) and Saif El-Nasr et al (1996) and others. They found that early planting date (March planting) showed superiority over late planting dates (April & May) in number of fruiting branches / plant, number of days to the 1 flower appearance and 1 boll opening. Meanwhile, other workers showed that late planting stimulate plan height and other vegetative traits, Dawood (1980); Yassen (1986); Makram et al (1994) and El-Debaby et al (1995 a & b). Concerning the effect of planting date on seed cotton yield, many investigators found that as planting date was delayed yield were reduced, Bilbra & Ray (1973); Yousef (1980); Nawar et al (1986) and Radwan et al (1995). Several investigators showed that cotton sowing dates affected significantly the yield, earliness %, lint percentages and fiber quality traits, Bilbro & Ray (1973); Stella et al (1980); Abbas et al (1983); Abdalla et al (1989) and El-Debaby et al Rizk; El-Agroudy; El-Sherif and Zizy Abbas Arab Univ. J. Agric. Sci., 23(1), 2015 92 (1995 a & b). On the other hand, Abuldahb (2001) and Abuldahab et al (2000) showed that lint index and lint index and fiber properties were not affected by sowing date. MATERIAL AND METHODS Two field experiments were conducted during 2001 and 2002 seasons at the Experimental Farm of Faculty of Agriculture at Fayoum, Cairo University at Dalla, Fayoum Governorate. The cotton experiments were conducted in the same field of the previous berseem trials to study the effect of preceding farm yard manure and preceding numbers of berseem cuts consequently "cotton planting dates" on growth, yield, yield components and fiber quality of cotton variety Giza 83. Each experiment was laid out in a split plot design with three replicates. The main plots were devoted for the farm yard manure treatments (FYM) (10, 20 m/ fad.) and the sub plots were assigned to berseem cultivars (Fahl & Meskawy). The sub plot size was 10.5 m (3.5 x 3 m) and contained six ridges. The cotton planting dates were corresponded to the number of berseem cuts taken and were as follows: March planting; Either after one cut of berseem c.v. Fahl or after two cuts of berseem c.v. Meskawy. April planting; after three cuts of Meskawy May planting; after four cuts of Meskawy

NEGATIVE INTERRELATIONSHIP BETWEEN NUMBER OF BERSEEM CUTS AND COTTON YIELD AS A FOLLOWING CROP