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 fresh leaf yield and quality i.e. total soluble carbohydr-ates and stevioside (the main sweetening agent) of stevia under six plant densities of 24000 to 48000 plants/fed. resulted from the treatment combinations of three inter-row spacing (58.3, 70.0 and 87.5 cm) and two intra-row spacing (15 and 20 cm) using two seed types (seedlings resulted from tissue culture and root rizomes) of the variety Spanti from Spain imported were evaluated in Giza Experimental Station, Agricultural Research Center during the period of September 1998 to July 2000, where a ten successive cuts were carried out. Results revealed that:For seedlings, plant population density of 40000 plants/fed (70x15 cm) gave the highest leaf yield (4.304 tons/fed.). However, for rizomes planting, plant population of 36000, 40000 and 48000 plants/fed.( 58.3 x 20cm, 70 x 15cm and 58.3 x 20cm), respectively, yielded the highest leaf yield (7.158, 7.226 and 7.793 tons/fed.).For both seedling types, increasing or decreasing the population density beyond that induced significant reduction in fresh leaf yield.Total soluble carbohydrate and stevioside content in the leaves were not significantly affected by either inter or intra row spacing or their interaction with cutting times.Fresh Leaf yield was increased gradually and significantly in successive cuts for both seed types and this increased was more pronounced in summer cuts and in the latest cuts. On the other hand, cutting time insignificantly affected leaf content of total soluble carbohydrate and stevioside.
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