Two field experiments were carried out during 2008/2009 and 2009/2010 seasons at Kafr El-Hammam village, Sharkia Governorate to study the effect of harvesting dates on productivity of some sugar beet varieties. Sugar beet varieties Gazella, Carola and Lola were planted on 1 st October in both seasons. Harvesting dates were done at 180, 195 and 210 days from sowing. The experimental design was a split-plot design with four replication, harvesting dates were allocated in the main plots and varieties in the sub-plots. Results showed that: delaying harvesting dates from 180 to 210 days from sowing significantly increased root fresh weight (g/plant), sucrose%, as well as root and sugar yield (tons/fed). While, nitrogen%, sodium%, potassium% were decreased significantly in both seasons. Harvesting dates at 195 days from sowing gave the highest values. Sugar beet varieties gave significant increase for root fresh weight (g/plant), sucrose%, as well as, root yield and sugar yield (tons/fed) in both seasons. While, sodium%, potassium% decreased significantly in both seasons. However, root diameter in the 2 nd season only. The interaction was significant in both seasons for root fresh weight (g/plant), sucrose%, root and sugar yield (tons/fed). However, root diameter in the 1 st season and sodium and potassium% in the 2 nd season., respectively. In general it can be concluded that harvesting Lola sugar beet variety at 195 days from sowing was the best treatment for maximizing sugar beet productivity in the newly reclaimed soils under the environment of this study.
Two field experiments were carried out during 2008/2009 and 2009/2010 seasons at Kom Oshem, Fayoum Governorate to study the effect of three hill spacing, 15, 20 and 25 cm and three sugar beet varieties Pleno, Sultan and Kawemira as well as their interaction on sugar beet productivity. Sugar beet varieties were planted on 1 st November in both seasons. The obtained results revealed that: increasing plant spacing from 15 to 25 cm increased significantly root length and diameter, fresh weight, sucrose%, root and sugar yields/fed. Impurities%, i.e. (N, Na and K) were decreased significantly in both seasons. Sugar beet varieties gave increased significantly root length, diameter, fresh weight, sucrose%, root and sugar yields/fed. Decreased significantly impurities% in both seasons. The interaction was significant in both seasons for root length, fresh weight and root yields/fed. In general, sowing sugar beet at 25 cm using Kawemira variety was the best treatment for maximizing productivity under the environmental conditions of this study.
ratoon) to investigate the effect of three row spacing (80, 100 and 120 cm), three nitrogen levels (170, 200 and 230 kg N/fed in plant cane and 185, 215 and 245 kg N/fed in the 1 st ratoon) on yield and quality of two sugarcane varieties viz. G.99-160 and G.T.54-9 (the commercial variety) in a split-split plot design with three replications.The results showed that planting sugarcane varieties in rows spaced at 80-cm apart attained a significant increases in cane stalk height, number of millable canes, cane yield/fed, brix, sucrose, sugar recovery percentages and sugar yield/fed compared with those planted at 100 and 120 cm. Significant increase in stalk diameter was recorded at 120 cm row spacing.The results indicated that the two sugarcane varieties differed significantly in cane stalk height, stalk diameter, number of millable canes, cane and sugar yields, whether they were grown as plant cane or 1 st ratoon crop, as well as brix, sucrose percentages in the 1 st ratoon. Insignificant variance was detected between the tested varieties in sugar recovery %, in the plant and 1 st ratoon crops.Raising N fertilization level from 170 to 200 kg N/fed for the plant cane and from 185 to 215 kg N/fed for the 1 st ratoon crop resulted in a significant increase in cane stalk height, stalk diameter, number of millable canes, cane and sugar yields /fed.Under conditions of the present work, growing G.T.54-9 and/or G.99-160 sugarcane varieties in rows of 80-cm apart and fertilized with 200 and 215 kg N/fed for the plant cane or 1 st ratoon, respectively, can be recommended to get the maximum cane and sugar yields/fed.
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