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Sudan Journal of Agricultural Research

Effect of different nitrogen rates on growth and yield of Guava (Psidum guajava L.) at New Halfa

Dawoud H. Dawoud , Fatima A. Ahmed1 and Ahmed A. Salih

Abstract:

The study was conducted for three seasons (1990 91, 91/92 and 92/93) at New Halfa sugar factory orchard, (150 19΄, N 380 41΄ E). The experiment tested 144 guava trees 12 years old and of white fruit type. The objective was to study the effect of different nitrogen rates on the vegetative growth, fruit quality and yield of guava at New Halfa. Nitrogen in the form of urea was applied at two equal doses; the first in October and the second dose in June. Throughout the experimental period, nitrogen rates resulted in a significant increase in tree height, trunk circumference, fruit weight, fruit size, fruit circumference, total soluble solids and leaf –nitrogen content than the control. The optimum rate of nitrogen fertilizer (per tree per year) for guava at New Halfa is 600 g in the form of urea to be applied into two doses, in October and June, respectively.





 

Sudan Journal of Agricultural Research Vol. 11  (2008) PP. 69-76