Influence of mineral fertilization [NP] on yield of long staple cotton[Gossypium barbadense L.] and some of its components

A Field experiment was carried out at the experimental farm of El-kod Agricultural Research Station, Abyan Governorate during 2009/2010 and 2010/201 Iseasons. The study aimed to determine the influence of ten levels of nitrogen and phosphate fertilizer [NOPO, N30P15, N30P30, N30P45, N60P15, N60P30, N60P45, N90P15, N90P30 and N90P45 kg / ha] in the form of urea 46% N and superphosphate P2O5 46. On yield and its components of long-staple cotton cultivar [Muallem 2000], the experiment included 10 treatment. The design of each experiment was RCBD with four replications was used. The area of each plot was 12 m2. Data were statistically analyzed according with the used design, treatments means were compared by L.S.D. test at 5% level. The results could be summarized as follows:oEffect on Yield and its components:1.The results indicated that the values of number of open boll/plant and seed cotton yield/plant were affected significantly by mineral in both seasons.2.Different yield per hectare of cotton seed significant depending on the different rates of mineral fertilization, andachieved the highest yield at the treatment [N60P30] were 5610 and 3582 kg / ha for both seasons "respectively, where the percentage increase 52.7% and 34.9% for the two seasons, respectively compared to the treatment of the control.3.There were no significant effect on weight of one boll, weight of 100 seeds, lint percentage and lint index due to variation in mineral in both seasons.oFiber properties:4.Length, strength and fineness characters were not significantly effected by variation in fertilizer nitrogen, phosphate in the two seasons of experimentation