Abstract:
This study was conducted in the fruit orchard of College of
Agricultural studies, Sudan University of Science and Technology at
Shambat, in the period of May/2006 – August/2006, to investigate the
effect of urea 46% N (source of nitrogen) and sulfur 80% S fertilizers on
growth parameters and oil content of balady lime and common sinnari
orange in two separate experiments.
The two experiments were composed of the following treatments:
100gm urea/tree, 60gm sulfur/tree and 100gm urea + 60gm sulfur (N/S)
and control (C). The experimental design used in both experiments was
randomized complete block design replicated four times with one tree per
plot.
Data was recorded at the end of the study period for the following
parameters: plant height, leaves number, branches number and oil content
of fresh leaves.
The results of the two experiments showed that the singular and
combined effects of urea and sulfur on number of leaves in lime and
orange were significant compared to control. However, combination of
urea and sulfur (N/S) treatment ranked top, while urea treatment (N)
ranked second with significant difference from sulfur treatment (S).
The results also exhibited significant differences in plant height. The
combination of urea and sulfur (N/S) resulted in the best increase in
means of plant height. There were no significant differences between the
single effects of urea (N) and sulfur (S) on either lime or orange.
The results showed highly significant differences in means of branches
number between treatments in the orange experiment. While the
combination of urea and sulfur (N/S) clearly increased the number of
III
branches compared to urea (N) and sulfur (S) treatments. In lime, the
singular urea effect on branching was not significantly different from
either the combination or the single sulfur effects. However, the
combination increased branching significantly compared to the singular
sulfur treatment.
In lime, all fertilizers treatments resulted in significant increase in leaf
oil content compared to the control. However, there were no significant
differences between the combination (N/S) and urea (N), also between
urea and sulfur treatments. The statistical analysis revealed that both urea
(N) and the combination (N/S) ranked top. Sulfur treatment was in the
second rank with significant differences from the control in the leaf oil
content of orange.
