Field experiments was carried out at Shandaweel Agricultural Research Station, Sohag Governorate during 2017/2018 and 2018/2019 seasons. The aim of this research to investigate three harvest dates at ages of(11,12 and 13 months)on the performance of five promising sugarcane varieties G.84-47,G.2003-47, G.2003-49,G.2004-27 and the commercial variety G.T.54-9 as a control. The harvest age up to 13 months recorded the highest values of cane and sugar yields in plant cane (52.08 and 5.95 tons/fed (fed=0.42ha), respectively) and first ratoon crops (55.16 and 6.70tons/fed, respectively).Varieties showed significantly differed in stalk length, stalks number, as well as brix, sucrose, sugar recovery percentages, cane and sugar yields (ton/fed.).The best performance was reported by the following varieties (G2004-27, G2003-47 and GT54-9) under all harvest ages, Also, these varieties registered the best cane yield (52.01,52.35 and 53.94 tons/fed, respectively) and sugar yields (5.48,6.09 and 6.03ton/fed,respectively).Results indicated significantly increasing physiological characters such as, leaf area index (LAI), crop growth rate (CGR),and net assimilation rate (NAR) with increasing harvest age as well as, these traits varied significantly between varieties. There is a positive and significant correlation between CGR, NAR and cane yield, which should be used to predict cane yield. Broad-sense heritability for cane and sugar yields and their traits varied from the lowest trait registered by stalk length(34.23%)to the highest value(95.82%)recorded by sucrose percentage. It could be more effective if selected higher heritability for yield than the lower. Varietal differences in growth and maturity rates should be taken into account when making harvesting decisions.

T HE PRESENT investigation was carried out at Shandaweel Agricultural Research Station, Sohag Governorate (latitude of 26°33'N, longitude of 31°41'E and Altitude of 69m), in the two successive seasons 2016/2017 and 2017/2018 to investigate the effect of study the effect of nitrogen, phosphorus and filter cake on yield and quality of sugarcane. The filed experimental work was carried out in a Randomized Complete Blocks Design (RCBD) using a split-split plot arrangement in three replications in both growing seasons. The results showed that increasing nitrogen levels from 150 up to 210kg N/fad resulted in a significant increase in plant length, diameter, stalk weight, number of millable canes, cane and sugar yields, as well as brix, sucrose, quality and sugar recovery percentages in both seasons. Super phosphate addition by rates 30kg P 2 O 5 /fad resulted in a significant increase in plant length, diameter, number of millable canes, stalk weight and cane and sugar yields, as well as brix, sucrose and sugar recovery percentages in both seasons. Results showed that the addition of filter cake by 4tons/fad give a significant increase in plant length, diameter, number of millable canes, stalk weight, cane and sugar yields, as well as brix, sucrose and sugar recovery percentages in both seasons.

Two field experiments were conducted in a sandy soil at Um Saber village, Kom Hamada, (latitude of 30.52° N and longitude of 30.79° E), El-Beheira Governorate, Egypt, during 2017/2018 and 2018/2019 seasons to find out the optimal levels of phosphorus, boron and magnesium to get the highest yield and quality of sugar beet. Sugar beet variety "Hamza" was sown. RCBD in a split-plot arrangement was used to lay out 27 treatments, represented the combinations of three phosphorus (P) levels (15, 30 and 45 kg P2O5/fed), three foliar levels of boron "B" (zero, 75 and 150 ppm) and three magnesium "Mg" levels (zero, 5 and 10 g MgSO4.7H2O/l). Raising P-level to 30 kg P2O5/fed considerably increased sucrose%, extracted sugar% (ES%), quality index (QI), sugar yield/fed in the 2 nd season, as well as root diameter, root fresh weight/plant (RFW) and root yield/fed, while, sugar lost to molasses (SLM%) was markedly decreased. Increasing B-level to 150ppm appreciably increased RFW, sucrose%, ES%, QI, root and sugar yields/fed. Raising Mg-fertilizer level to 10 g/l sharply increased RFW, sucrose%, ES%, QI, root and sugar yields/fed in both seasons, while SLM% substantially reduced in the 2 nd one. Effects of the significant interactions among phosphorus, boron and magnesium levels on the studied traits were discussed. Under the environmental conditions of this study, adding 30 kg P2O5/fed to the soil + spraying 150 ppm boron + spraying 10 g MgSO4.7H2O/l could be recommended to attain economical root and sugar yields/fed, as well as the best quality of sugar beet.

Two field experiments were carried out at western desert of Sohag Governorate, Egypt (latitude of 26 61' N, longitude of 31? 52 ' E and altitude of 72 m) in 2015/2016 and 2016/2017 seasons to find out the optimal plant age at harvest (180, 195 and 210 days from sowing) of the three multi-germ sugar beet varieties namely Hosam, Sahar and Kawemira under condition of a new reclaimed soil in Sohag. A Randomized complete blocks design using a splitplot arrangement with four replications was used in both seasons, where the main plots were devoted for sugar beet varieties, while plant ages of harvesting were randomly distributed in the sub plots. The results showed that sugar beet varieties differed significantly in all studied traits. Hosam variety was superior in root length, root yield/fed and root fresh weight/plant in both seasons. However Kawemira variety had the thickest root diameter and heaviest top fresh weight/fed in both seasons, as well as TSS% in the1 st one. Sahar variety attained the highest values of sucrose and sugar yield/fed in both seasons, in addition to TSS% and purity% in the 2 nd one. delaying harvesting from 180 up to 210 days from sowing increased significantly root length, diameter and root fresh weight/plant, root and sugar yield/fed as well as TSS and sucrose % in both seasons and purity % in the 1 st one. Beets harvested at age of 180 days attained the highest value of top fresh weight/fed in both seasons. Interactions between sugar beet varieties and ages of harvesting were significant except purity%, in the1 st season. In the 2 nd one, TSS, sucrose %, root and sugar yield/fed were significantly affected by the interaction between the two factors. Under the conditions of this work, harvest sugar beet Hosam and Sahar varieties after 210 days after sowing can be recommended to obtain the highest root and sugar yields/fed in the new reclaimed soil in Sohag Governorate.

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