EFFECT OF NITROGEN AND PHOSPHORUS ON THE YIELD, NITRATE REDUCTASE ACTIVITY AND UPTAKE OF NUTRIENTS IN SOYBEAN (Glycine max (L.) Merrill).
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Date
1989
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD.
Abstract
A pot culture experiment was conducted in Rabi 1988 on
black soil (Typic chromustert) collected from Agricultural
College Farm, Bapatla in Guntur district of Andhra Pradesh to
study the effect of different levels of nitrogen and phosphorus
on yield, uptake of nutrients and nitrate reductase activity in
Hardee variety of soybean. There were 16 treatment
combinations comprising four levels of nitrogen (0, SO, 100 and
200 kg N ha-1 ) and four levels of phosphorus (0, SO, 100 and 200
-1 .
kg P2os ha ) replicated six times in split plot design.
Application of graded levels of chemical nitrogen And
phosphorus in general gradually increased the drymatter
production at 30 DAS, haulm yield at harvest and seed yield
from 0 to 100 kg ha -1 each and maximum seed yield was
-1
obtained when applied combinedly @ 100 kg N+lOO kg P2o5 ha .
The uptake of nutrients viz., N, P, K, s' Ca, Mg, Fe
and c !.l by haulm at harvest and by seed increased with
increasing levels of N and P upto 100 kg ha -1 each and it was
maximum when applied combinedly @ 100 kg N+100 kg P2o5
ha -1 .
However, Mn and Zn uptakes were maximum at 100 kg N + 50 kg
P
2o5 ha-~ and 100 kg N + 0 kg P2o5 ha-1 respectively.
Nitrate reductase activity in leaf increased with
increasing levels of N and P2o5 upto 100 kg ha-1 each and
maximum activity was obtained with the combined application
of 100 kg N + 100 kg P -1 2o5 ha . Nitrate reductase
was maximum at 30 DAS compared to 45 DAS and 60 DAS.
activity
Protein content increased with increasing levels of N
and P2o5 upto 100 kg ha-1 each and was highest at 100 kg N +
100 kg P -1 2o5 ha
Nitrogen fertilization decreased the oil content while
phosphorus fertilization increased it.
Nitrogen fertilization decreased significnatly the
palmitic, stearic and oleic acids but increased the linoleic
and linolenic acid contents while phosphorus fertilization
resulted in significant increase in palmitic, stearic and
oleic acid contents while the trend was irregular with
linoleic and linolenic acids.
The multiple correlations worked out between seed yield
and uptake of nutrien~s by haulm at harvest; seed yield and
uptake of nutrients by seed; seed yield and nitrate reductase
activty at ยท30 DAS, 45 DAS and 60 DAS; uptake of nutrients by
seed and nitrate reductase activity at 30 DAS_, 45 DAS and 60
DAS; seed yield and yield attributing chracters (seeds pot:
-1
and pods pot -1 ) and nitrate reducatase activity at 30 DAS, 45
DAs and 60 DAS and protein content were positive and
significant.
Among the fatty . acid components, stearic acid was
positively and significantly correlated with oleic acid,
while linoleic acid was positively and significantly
correlated with linolenic acid.
Palmitic acid was significantly and negatively
correlated with linoleic and linolenic acids. Stearic acid
was negatively and significantly correlated with linoleic and
linolenic acids. The correlations between total saturated
fatty acids (palmitic acid + stearic acid) and total
unsaturated fatty acids (oleic + linoleic + linolenic acids)
were ~egative -~ significant. Total unsaturated fatty acids
(oleic + linoleic + linolenic acids) were negatively and
significantly correlated with individual saturated fatty
acids viz., stearic acid and palmitic acid.
Description
Keywords
EFFECT, NITROGEN, PHOSPHORUS, YIELD, NITRATE, REDUCTASE, ACTIVITY, NUTRIENTS, SOYBEAN