The aim of the present study was to select the suitable sowing date and the proper varieties which perform high yielding ability, juice quality and processing parameters under agro-climatic conditions of El-Giza governorate. Two field trials were carried out at Giza Experimental Station, Agricultural Research Center. Fourteen sweet sorghum varieties were evaluated for their yielding ability, juice quality and processing parameters under two sowing dates i.e. May 5 th and 25 th . Analysis of variance showed: most yielding traits, juice quality and processing parameters acted better in the early planting date (May 5) than in the late ones (May 25). Great variation in most studied traits has been detected among the fourteen sweet sorghum varieties under investigation. Not all sweet sorghum varieties perform good for stalk, syrup and alcohol production, quality and processing parameters in the first planting date, but some of them were suitable for the second planting date. Varieties viz., Mn3306, Planter, Rex, Rio, SS405 and Tracy were distinguished with high potential ability for producing syrup and ethanol. Therefore, these varieties are recommended for dual purpose.

The present investigation was carried out to study the effect of planting and harvesting time on yield and quality of sugar beet cultivars under North Sinai conditions.Two field experiments were conducted in a newly reclaimed sandy soil in a private farm at North Sinai region to study the effect of three sowing dates (1 st Aug., 1 st Sep. and 1 st Oct.) and three harvesting dates (170, 190 and 210 days after planting) on yield and quality of six sugar beet cultivars, viz.,Pamela, Hipoly2, Pleno, Monte Bianco, Oscar poly and Gloria. The results obtained from this study showed that sowing dates had significant effects on sucrose and purity per cent, as well as, root and sugar yields/fed in both seasons. The highest root and sugar yield were obtained from the 1 st Sept. sowing. Harvesting after 210 days from sowing recorded the highest root weight, sucrose and purity per cent as well as root and sugar yields/fed. Oscar poly variety recorded the highest root yield but, Monte Bianco cultivar surpassed all cultivars in sugar yield. The interaction between each two factors under study was insignificant. The response equation of root yield/ fed to delaying harvest showed diminishing returns. The results revealed that a higher predicted root yield than that retained herein, could have been obtained if harvest was delayed beyond 210 days after sowing.

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Ammonium uranates / Uranium oxides / Thermal decomposition SummaryAmmonium uranates (AU) were precipitated from a nuclearpure uranyl nitrate solution using ammonia liquor. Unwashed and washed uranate samples were heated at temperatures varying between 400° and 800°C and analysed thermally and by Xray diffraction analysis. The results indicated that amorphous uranium trioxide (A-UO,) is mainly formed in absence of carried ammonium and nitrate ions, whereas deamination of the retained ammonia leads to y?-U0 3 formation. The retained ammonium ions in the AU structure increased with the pH of precipitation and these ions lead to formation of two polymorphs of uranium octoxides.

Two field experiments were conducted in Mallawi Agricultural Research Station, Minia Governorate during 2009/2010 and 2010/2011 growing seasons to find out the proper panting method (ring or row planting methods) on juice quality traits, cane and sugar yields of four sugarcane varieties (Phil.8013, G.99-103, G.2000-176 and G.84-47). A split plot design with three replications was used in both seasons, where the panting methods and density were allocated in the main plots, while the sugarcane varieties were randomly distributed in the sub-plots. Ring (pit) area was 0.64 m 2 (90-cm diameter). Rings were dug to a 45-cm depth. In each ring, 5 kg farmyard manure was mixed uniformly before placing the setts for planting. Rings were planted with 20, 30 and 40 buds/ring and covered with 2-5 cm soil. Plot area was 35 m 2 , which consisted of 5 ridges of 1 m apart and 7 long. Sugarcane varieties were planted in the 1 st week of March in both seasons. All agronomic practices were done as recommended for growing sugarcane crop.Ring planting method recorded a significant increase in stalk height, sucrose%, purity%, sugar recovery% and cane and sugar yields/fed.The evaluated sugarcane varieties differed significantly in stalk height, stalk diameter, sucrose%, purity%, sugar recovery%, cane and sugar yields/fed. Sugarcane Phil.8013 and G.84-47 varieties recorded the highest cane and sugar yields/fed.The interaction between the two factors had significant effects on all studied traits.Therefore, under conditions of the present work, planting sugarcane varieties Phil.8013 and G.84-47 in rings using 30 buds/ring could be recommended to get the highest cane and sugar yields/fed.