Effects of planting date and time of nitrogen application on yield and
sugar content of sweet sorghum
A. Almodares and S.M. Mostafafi
Darany
Biology Department, College of Science,
University of Isfahan, Isfahan, Iran 81846-73441
(Received: 27 May, 2005 ; Accepted: 19 December, 2005)
Abstract: This experiment was conducted at Azad University
experiment station to evaluate
the effects of planting date and time of nitrogen application on yield and sugar content of sweet sorghum in
2003. Four planting dates (May 4, March 19, June 3 and June 18) and three stages of nitrogen application (3-5/8 leaf
stage, boot stage and soft dough stage) were
assigned to the main and subplots, respectively. Plant height and diameter,
fresh stalk yield, total dry weight, brix value
(soluble solids), sugar content and grain yield were affected by planting date.
For all the characteristics, the maximum value was obtained by the first planting date. Only stem height,
diameter and total plant dry weights
were affected by time of nitrogen application. In these cases, nitrogen
application at (3-5/8) leaf stage was superior to others. According to the
results, sweet sorghum should be planted on the beginning of May and nitrogen be applied at (3-5/8)
leaf stage.
Key
words: Sweet sorghum, Planting dates,
Nitrogen application, Sugar contents.
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