This study was conducted during two successive seasons (2012/2013 first ratoon and 2013/2014 second ratoon) on Williams banana cultivar grown in clay loam soil under flood irrigation system in a private banana orchard located at El-Hagabey district, Meet Ghamr Dakahlia Governorate, at 3x3.5 m apart. Forty five stools/(mat) ,each containing two plants of Williams cultivar were chosen to evaluate the effect of foliar spray with Cobalt , Vit B 12 and ascorbic acid ( Vit C) singly, double or in triple combinations, beside control treatment on yield and fruit quality of the tested Williams banana cv. These treatments were arranged in a randomized complete blocks design with three replicates. The obtained results could be summarized as follows:Sprayed banana plants with the mixture of cobalt sulphate + Vit B 12 + Vit C at 50+50+500 ppm each (T 14 ) recorded increases in bunch weight, yield /fed. and number of fingers /bunch were about 63.34 , 65.49 and 15.22 % over control treatment, respectively. The plants which sprayed with the mixture of cobalt sulphate + Vit C at 100+1000 ppm each (T 11 ) gave the highest values of hand and finger weight and recorded increases about 54.00 and 62.82% over control treatment, respectively .The highest values of total sugars , SSC/TA and Vit.C were obtained by the plants which sprayed with cobalt sulphate + Vit B 12 + Vit C at 100+100+1000 ppm each (T 15 ) average two seasons and recorded the relative increases were about 24.62, 100.56 and 44.34% over control, respectively.

Research was carried out on the oxidation of cellulose by ozone treatment. It is considered as environment friendly in comparison with the existing oxidation methods used in industry for a long time. This treatment is used in different applications such as the scouring / bleaching of cotton fabrics and in improving the properties of Kraft pulp cellulose in the paper industry. In this study, the effect of Ozone treatment on cotton yarn properties was investigated. This investigation can help in obtaining the maximum crystalline percentage of cotton for the production of nano-crystalline cellulose. Two-ply cotton ring spun yarn was treated with ozone gas for different time periods. Yarn tensile properties, wickability, the copper number and physical appearance were observed. It is evident that yarn tensile properties deteriorate drastically after a certain time, while the wickability and copper number increase simultaneously.

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