EFFECT OF Bradyrhizobium INOCULATION AND METHODS OF MOLYBDENUM APPLICATION ON GROWTH, NITROGEN FIXATION AND YIELD OF TWO SOYABEAN (Glycine max (L.) Merrill) CULTIVARS
EFFECT OF Bradyrhizobium INOCULATION AND METHODS OF MOLYBDENUM APPLICATION ON GROWTH, NITROGEN FIXATION AND YIELD OF TWO SOYABEAN (Glycine max (L.) Merrill) CULTIVARS
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Date
1999-05
Authors
IYAMABO, CECILIA ISIBHAKHOMEN
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Abstract
Field experiments were conducted at the Institute for
Agricultural Research Farm, Samaru, Zaria during the wet
seasons of 1995 and 1996 to study the effect of Bradyrhizobium
inoculation and methods of molybdenum application on two
soyabean {Glycine max (L.) Merrill) cultivars. The treatments
consisted of two soyabean cultivars (SAMSOY-2 and
TGx 1019-2EN), two methods of molybdenum application (seed
treatment with 217-gMo/ha, foliar spray with 217g Mo/ha) and
a no molybdenum control) and three levels of Bradyrhizobium
inoculation (uninoculated, inoculation with Bradyrhizobium)
strain IRJ 2184 and R.25B). Maize given no molybdenum,
molybdenum as seed treatment and foliar spray was included as
a reference crop. The twenty-one treatments of which three
were reference treatments were arranged in all possible
factorial combination in a randomized complete block design
and replicated four times.
Bradyrhizobium inoculation with strain R.25B isolated
from the nodules of soyabean at Samaru increased nitrogen
fixation. Leaf area and leaf area index were significantly
increased by strain R.25B. Strain R.25B increased grain yield
by 15%. Yield increases were as a result of higher pod weight
per plant, number and weight of seeds per plant and one
hundred seed weight. Strain IRJ 2184A isolated from nodules
of soyabean plant at Ibadan proved to be ineffective.
Molybdenum applied either as seed treatment or foliar
spray significantly increased nitrogen fixation by 15% and 19%
respectively. Also significantly increased were actual and
relative uriede nitrogen, leaf dry weight, leaf area and leaf
area index. Yield increases of 15% and 19% were obtained with
the application of molybdenum as seed and foliar treatment
respectively. This yield increase was as a result of higher
number and weight of pods per plant, number and weight of
seeds per plant and one hundred seed weight. When applied at
the pre-bloom stage, foliar applied molybdenum was as
effective as seed treatment.
The shorter determinate SAMSOY-2 cultivar exhibited more
vigorous vegetative growth in terms of leaf number and weight,
leaf area and leaf area index than the taller indeterminate
TGx 1019-2EN cultivar. SAMSOY-2 out yielded TGx 1019-2EN by
25%.
Soyabean fixed between 37-115kgN/ha which was 24-92% of
its total nitrogen
Description
A Thesis Submitted to the postgraduate School, Ahmadu
Bello University, in Partial Fulfillment of the
Requirements for the Degree of Master of Science
(M.Sc) in Agronomy
DEPARTMENT OF AGRONOMY
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA - NIGERIA
MAY, 1999
Keywords
INOCULATION,, Bradyrhizobium,, MOLYBDENUM,, FIXATION,, SOYABEAN,, (Glycine max (L.) Merrill),, CULTIVARS