Two field trials were conducted during 2012/2013 and 2013/2014 seasons at El-Manyal Village, Talkha District, Dakahlia Governorate, to study the effect of plant distribution sowing patterns and nitrogen fertilizer levels on yield and quality of sugar beet, "cv. Kawemira". The obtained results indicate that: 1-Sowing distribution patterns had significant effects on all studied characters over the two seasons, except for root diameter in the second season The studied sowing patterns (28, 24 and 20 or 35, 30 and 25 cm between hills in the two sides of terrace (mastaba) led to significant differences on the most of the studied characteristics in both seasons. Sowing beet seeds in both sides of terrace 80 cm width at 25 cm distance between hills led to significant increase in yields of roots, gross sugar and white sugar (t/fad) as well as the percentage of the extractable white sugar. 2-Increasing nitrogen fertilizer levels from 80 to 100 and 120 kg N/fad, significantly increased root fresh weight (g), root diameter, sugar loss percentage, the yields of root, gross sugar, white sugar and lost sugar/fad in both seasons besides root length (cm) in the second season. On the other side, it significantly decreased root gross sugar and extractable white sugar percentages in both seasons. Generally, it could be concluded that sowing sugar beet seeds at 25 cm apart between hills on the two sides of terrace (mastaba) 80 cm width and adding 120 kg N/fad is recommended to maximize its productivity and quality under the environmental conditions of Dakahlia Governorate.

Two field trials were conducted during two successive growing seasons of 2016/2017 and 2017/2018 at Mallawy Agricultural Research Station, Agricultural Research Center, El-Minia Governorate (Middle Egypt) to study the effect of different levels of Nfertilization (160,190 and 220 kg /fed) on yield, yield components and quality of five sugar cane varieties (G.T.54-9(C9), G.2003-47, G.99-103, G.2004-27 and G.2010-7). A split plot design with three replications was used, main plots were represented by five sugar cane varieties (V1= G.T.54-9(C9), V2= G.2003-47, V3= G.99-103, V4= G.2004-27, V5= G.2010-7). The subplots were used for the three nitrogen levels (160, 190 and220 kg N / fed). The results indicated that: 1-Sugar cane varieties and N-fertilization levels exhibit significant effect on all studied traits in both seasons. Promising variety G.99-103 recorded the highest values of stalk hieght, stalk diameter (cm), millable cane ton/fed and sugar yield (ton/fed) in both seasons, while G.T.54-9(C9) variety recorded the highest values of sucrose %, purity% and sugar recovery%, whoever G.2004-27 variety outyielded the highest value of TSS%2-Increasing applied N levels from 160 up to 220 Kg N/fed significantly increased stalk height, stalk diameter(cm), millable cane ton / fed, sugar yield (ton/fed) and TSS (%), while190 Kg N/fed had the highest values of purity% and Sugar recovery%.3-The effect of interaction between sugar cane varieties and nitrogen levels on the studied traits was significant for stalk height in both seasons and purity%, sucrose % and T.S.S. % in plant crop season only. Generally, it could be concluded that under Middle Egypt conditions, it is recommended to inoculate G.99-103 sugar cane varieties with 220 Kg N/fed to maximize the productivity and quality of sugar cane yield.

No abstract

In order to investigate the effect of nitrogen fertilizer levels, sowing date and harvesting age on growth yield and root quality of sugar beet. Four field experiments were conducted at Mallawi Research Station, El-Minia Governorate during 2015/2016 and 2016/2017 seasons. Sugar beet sown at two dates (the 1 st of September and October) fertilized with three nitrogen levels (80, 100 and 120 kg N/fed.) and harvested at three ages (180, 195 and 210 days after sowing). The results showed that all studied traits of sugar beet were significantly affected by sowing date in both seasons. The highest values of root length, diameter, root fresh weight, as well as α-amino N, Na, K, sugar lost to molasses, root and corrected sugar yields were obtained by delaying sowing date from September 1 st to October 1 st . On the contrary, an higher sucrose, quality and corrected sugar percentages were detected in beets sown earlier in September. Raising nitrogen fertilization level from 80 to 100 and 120 kg N/fed. resulted in a gradual and significant increases in root fresh weight, root length and diameter, root yield, sugar lost to molasses and corrected sugar yield in both seasons. While, alkalinity coefficient and quality percentages were decreased. The highest sucrose and corrected sugar percentages were recorded by applying 100 kg N/fed. The studied traits were markedly influenced by plant age at harvesting in both seasons. Root length and diameter, root fresh weight and yield/fed, sucrose, quality, corrected sugar percentages and corrected sugar yield/fed. were increased gradually with increasing plant age at harvest from 180, 195 to 210 days, in both seasons, while Na, sugar lost to molasses and alkalinity coefficient were decreased. Under these conditions of the present work, sowing sugar beet on October 1 st , with nitrogen fertilization at rate of 120 kg N/fed. and harvested at 210 days from sowing could be recommended to obtain the highest root yield/fed., while harvesting it after 195 or 210 days to get the highest sugar yield/fed.