Tow field experiments were carried out at Mallawi Agricultural Research Station, Minia Governorate grown as plant cane in 2008/2009 and 2009/2010 seasons and the 1 st ratoon crops in 2009/2010 to investigate three harvest dates at ages of (10, 12 and 14 months) on the performance of two promising sugar cane varieties G.99-80, G.99-160 and the commercial variety G.T.54-9 as a control. A split plot design with four replications was used in both seasons. Harvest dates treatments were allocated in the main plots while sugar cane varieties were randomly distributed in the sub plots. The results showed that harvest date up to 14 months recorded the highest values of stalk height, weight kg/plant and cane yields/fed in plant cane and 1 st ratoon crops over the other two harvest dates. Sugarcane varieties differed significantly, where G.99-80 variety recorded the highest stalk height, weight kg/plant, cane and sugar yields in the plant cane and 1 st ratoon crop over the other two varieties., in respectively. G.99-160 variety surpassed G.99-80 and G.T.54-9 varieties in brix% in plant cane in both seasons and 1 st ratoon crop. G.T.54-9 surpassed in stalk diameter, sucrose% and sugar recovery%. The interaction between sugar cane variety G.99-80 and 14 months harvest date in 1 st plant cane and 1 st ratoon crop to obtain the highest cane yields. Under conditions of this work, 14 months for the plant cane and the 1 st ratoon crop of G.99-80 variety grown at Mallawi represent Middle Egypt can be recommended to obtain the highest cane and sugar yields/fed.
Two field trails were carried out at El-Mattana Agricultural Research Station (Luxor Governorate) to study the performance of sugarcane G.84-47 variety grown as plant cane in 2008/2009 and 2009/2010 seasons and the 1 st ratoon crops in 2009/2010 under two seed rates of 1.5 and 2.0 rows of cane cuttings (12600 and 16800) of three-budded cane cuttings, i.e. 37800 and 50400 buds/fed and three nitrogen fertilization levels of 150, 180 and 210 kg/fed, respectively. A split plot experimental design with four replications was used, where the main plots were assigned for seed rates while nitrogen levels were distributed in the sub plots. The results showed that, seed rates differed significantly, where 50400 buds/fed recorded the highest values of stalk height, sucrose%, purity%, sugar recovery%, millable cane/fed, cane and sugar yields/fed in the plant cane and 1 st ratoon crop, respectively. While, seed rate 37800 buds/fed recorded the highest values of stalk diameter, brix% and impurities% in the plant cane and 1 st ratoon crops. Increasing nitrogen fertilizer level up to 210 kg N/fed given to G.84-47 recorded the highest values of stalk height, number of millable cane/m 2 and cane yield, which increased sugar yield/fed. whereas, 180 kg N/fed recorded the highest mean values of stalk diameter, sucrose%, purity%, sugar recovery%. The interaction between nitrogen levels 210 kg N/fed with 50400 buds/fed attained the highest mean values of cane and sugar yields (ton/fed) in the plant cane and 1 st ratoon crop. Under conditions of this work, adding 210 kg N/fed with seed rate 50400 buds/fed can be recommended to obtain the highest cane and sugar yields.
Two field trials were conducted during 2009/2010 and 2010/2011 seasons in Nubaria Research Station. Alexandria Governorate. The major goal was to study the effect of nine treatments which represented the combination between three foliar spray of some micronutrients solution levels (1/4, 1/2 and 3/4 /300 L water/fed) at 45 and 75 days from sowing and three nitrogen fertilizer levels of (80, 100 and 120 Kg/fed). A split plot design with four replications was used. The main plots were assigned to foliar spray with some micronutrients solution, whereas, nitrogen fertilizer in the sub plots. The obtained results revealed that: foliar spray of micronutrients solution level at 1/2 l/fed attained a highest values for root diameter and fresh weight/plant, as well as, sucrose%, purity%, root and sugar yields/fed. While, N, Na and K% were decreased in both seasons. Foliar spray of micronutrients solution level at 3/4 l/fed increased root length and macroelements (g/100 g DW) in both seasons. Application of nitrogen fertilizer at 120 kg N/fed gave the highest mean values of root length, diameter, fresh weight/plant, root and sugar yields/fed. On the contrary, a gradual reduction in sucrose% and purity% had been detected with the increase in nitrogen level over 80 kg N/fed. Interaction between foliar spray of some micronutrients solution levels 1/2 l/fed and nitrogen fertilizer at 120 kg/fed significantly affected on sucrose%, root and sugar yields/fed in both seasons.
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