GROWTH AND YIELD OF SOYABEAN (Glycine max (L.) Merrill) AS AFFECTED BY NITROGEN AND PHOSPHORUS FERTILIZATION
GROWTH AND YIELD OF SOYABEAN (Glycine max (L.) Merrill) AS AFFECTED BY NITROGEN AND PHOSPHORUS FERTILIZATION
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Date
1992-11
Authors
OJIKPONG, THOMAS OGON
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Abstract
A field experiment was conducted during the 1990 cropping
season at Sarnaru, northern Guinea Savana Zone of Nigeria to
investigate the response of soyabean (C.V. SAMSOY 2) to different
levels of nitrogen and phosphorus fertilizer.
Treatments consisted of factorial combinations of four levels
each of nitrogen (O, 20, 40 and 60kg N ha ) and phosphorus
(O, 17, 35 and 52kg P ha ) laid out in a randomized complete
block design and replicated four times.
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The application of N at the rate of 20kg N ha increased
Modulation significantly at the initial growth stage. Increasing
the level of N above 20kg N ha " resulted in decreased number of
nodules. Although N enhanced plant growth, it had no significant
effect on grain yield. Modulation was increased significantly by
phosphorus fertilizer application. Similarly P enhanced plant
growth up to the highest level of applied P (52kg P ha ), but
grain yield responded up to 17kg P ha -1 •
Grain yield reduction was as much as 54% when no P fertilizer
was applied (1325kg ha ). The nitrogen concentration in plant
decreased with increasing N application while increasing P
fertilizer application increased grain nitrogen concentration.
The interaction between N and P was significant on some growth
parameters but not on grain yield and yield components.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, IN PARTIAL FULFILLMENT
OF THE REQUIREMENTS OF THE DEGREE OF MASTER
OF SCIENCE IN AGRONOMY
DEPARTMENT OF AGRONOMY
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA
NOVEMBER, 1992
Keywords
GROWTH,, YIELD,, SOYABEAN,, (Glycine max (L.) Merrill),, AFFECTED,, NITROGEN,, PHOSPHORUS,, FERTILIZATION.