EFFECTS OF NITROGEN AND PHOSPHORUS ON THE GROWTH AND YIELD OF SWEET POTATO (Ipomoea batatas (L) Lam)
EFFECTS OF NITROGEN AND PHOSPHORUS ON THE GROWTH AND YIELD OF SWEET POTATO (Ipomoea batatas (L) Lam)
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Date
1985-12
Authors
DUTSIN-MA, IBRAHIM HABIBU
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Abstract
Investigation was carried out at Samsru during the 1984
wet season to observe the effect of nitrogen and phosphorus
on the growth and yield of sweet potato. The treatments
comprised three levels each of nitrogen and phosphorus (0, 6O
and 120kg N/ha; 0, 30 and 60kg P2O5/ha) and two varieties
(TIS 9265 and TIS 2498).
The investination revealed that application of nitrogen
affected the growth, yield components and yield of sweet
potato, while phosphorus application had no effect on the
growth, yield components and yield, Application of 60kg N/ha
significantly increased the total and marketable yields by 58.2
and 75.2 per cent, respectively over the control.
However increasing the level to 120kg N/ha significantly
reduced these yields by 23.8 and 33.8 per cent, respectively
when compared with the 60kg N/ha level. The number of tubers
was significantly reduced by the application of 120kg N/ha,
while the application of 60 and 120kg N/ha significantly
increased the tuber weight. But the difference between the
two levels was not significant.
It was also revealed that the two varieties respond
similarly to nitrogen fertilization, although variety TIS 2498
was superior over TIS 9265 in terms of total and marketable
yields, the number of tubers, marketable tubers as well as
vegetative character of dry matter production.
Description
A thesis submitted to the Postgraduate School,
Ahmadu Bello University
in partial fulfillment of the requirements for
the Degree of Master of Science in Agronomy
DEPARTMENT OF AGRONOMY
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA
Keywords
EFFECTS,, NITROGEN,, PHOSPHORUS,, GROWTH,, YIELD,, SWEET POTATO,, Ipomoea batatas (L) Lam