INFLUENCE OF ZEOLITE ON NITROGEN USE EFFICIENCY AND GRAIN YIELD OF MAIZE GROWN IN RED SOILS.
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Date
2019
Authors
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PROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY
Abstract
The present study was taken up to evaluate the influence of zeolite on nitrogen use
efficiency and grain yield of maize grown in red soils. A pot culture study was conducted
during kharif, 2018-19 in Green House of Department of Soil Science and Agricultural
Chemistry, College of Agriculture, Rajendranagar, Hyderabad.
The soil required for the present experiment has been collected from B block of
Student farm, College of Agriculture, Rajendranagar. The experiment was conducted in
Factorial Completely Randomized Design (FCRD) with 13 treatments replicated three
times. The treatments were T1 - No Nitrogen and No Zeolite (control), T2 - Nitrogen @100
kg ha-1
+ No Zeolite (N100Z0), T3 - Nitrogen @ 100 kg ha-1
+ Zeolite @ 2.5 t ha-1
(N100Z2.5) ,
T4 - Nitrogen @100 kg ha-1
+ Zeolite @ 5 t ha-1
(N100Z5), T5 - Nitrogen @100 kg ha-1
+
Zeolite @ 7.5 t ha-1
(N100Z7.5), T6 - Nitrogen @ 150 kg ha-1
+ No Zeolite (N150Z0), T7 -
Nitrogen @ 150 kg ha-1
+ Zeolite @ 2.5 t ha-1 (N150Z2.5), T8 - Nitrogen @ 150 kg ha-1
+
Zeolite @ 5 t ha-1
(N150Z5), T9 - Nitrogen @ 150 kg ha-1
+ Zeolite @ 7.5 t ha-1
(N150Z7.5),
T10 - Nitrogen @ 200 kg ha-1
+ No Zeolite (N200Z0), T11 - Nitrogen @ 200 kg ha-1
+ Zeolite
@ 2.5 t ha-1
(N200Z2.5), T12 - Nitrogen @ 200 kg ha-1
+ Zeolite @ 5 t ha-1
(N200Z5) and T13 -
Nitrogen @ 200 kg ha-1
+ Zeolite @ 7.5 t ha-1
(N200Z7.5). Recommended dose of P and K
were applied @ 60-60 kg ha-1
(24.29 - 24.29 mg pot-1
) uniformly to all the treatments. Soil
was sieved and mixed with zeolite before filling of pots as per treatments. Maize seeds
(DHM-117) were sown in the pots @ 5 seeds pot-1
and one out of 5 seeds was maintained
in each pot till harvest.
Zeolite has significant effect on soil pH, EC, CEC and exchangeable cations. The
highest soil pH, EC, CEC and exchangeable cations were recorded in Z7.5 followed by Z5.
The zeolite application significantly reduced bulk density of soil. Zeolite @ 7.5 t ha-1 (Z7.5)
recorded lowest bulk density (0.97 g cc-1
). Zeolite significantly improved water holding
capacity from 33.34 % in Z0 to 48.54 % in Z7.5. The combination of nitrogen and zeolite
had no significant effect on bulk density and water holding capacity.
Name of the author : CHITTETI RAVALI
Title of the thesis : “INFLUENCE OF ZEOLITE ON NITROGEN USE
EFFICIENCY AND GRAIN YIELD OF MAIZE
GROWN IN RED SOILS”
Degree : MASTER OF SCIENCE IN AGRICULTURE
Faculty : AGRICULTURE
Department : SOIL SCIENCE AND AGRICULTURAL CHEMISTRY
Major Advisor : Dr. K. JEEVAN RAO
University : PROFESSOR JAYASHANKAR TELANGANA STATE
AGRICULTURAL UNIVERSITY
Year of submission : 2019
There was no significant effect of zeolite, nitrogen and their combination on soil
OC. Available nitrogen at 30, 60, 90 DAS and at harvest was not significantly influenced
by zeolite, nitrogen and their combination. Irrespective of the nitrogen level, the available P
at 30, 60, 90 DAS and at harvest were highest in the treatment receiving 7.5 t ha-1 zeolite.
Available K at 60, 90 DAS and at harvest highest in N100Z7.5 (Nitrogen @ 100 kg ha-1 +
Zeolite @ 7.5 t ha-1
). But at 30 DAS, the interaction effect between nitrogen and zeolite
was non significant.
The nitrogen content gradually decreased with the age of the crop. N content in
maize at 60, 90 DAS and at harvest was highest in N200Z7.5 (Nitrogen @ 200 kg ha-1 +
Zeolite @ 7.5 t ha-1
). But at 30 DAS, there was no significant effect of combination of
zeolite and nitrogen on nitrogen content. Among different treatments, N200Z7.5 recorded
highest phosphorous content and P uptake at 30, 60 DAS and maize stover. At 90 DAS and
in maize grains, there was no significant effect of combination of nitrogen and zeolite. The
K content at 30, 60, 90 DAS and at harvest was not significantly affected by combination of
different levels of nitrogen and zeolite, but however zeolite and nitrogen individually had
significant effect on K content at 30, 60, 90 DAS and at harvest.
The P uptake was gradually increased from 30 DAS to harvest. The P uptake at 30,
60, 90 DAS and at harvest was highest in N200Z7.5. N and K uptake by maize at 60, 90 DAS
and at harvest was highest in N200Z7.5 (Nitrogen @ 200 kg ha-1 + Zeolite @ 7.5 t ha-1
). But
at 30 DAS, there was no significant effect of combination of zeolite and nitrogen on
nitrogen uptake.
Irrespective of the nitrogen level, NUE (N recovery and agronomic use efficiency of
N) showed an increasing trend with the increase of zeolite levels, nitrogen levels and their
combination. The highest N recovery and agronomic NUE was obtained in N200Z7.5
(Nitrogen @ 200 kg ha-1 + Zeolite @ 7.5 t ha-1
), was on par with N200Z5 (Nitrogen @ 200
kg ha-1 + Zeolite @ 5 t ha
-1
).
The dry matter production increased with increase in the age of the crop. Highest
dry matter production was observed at 90 DAS. The combination of zeolite and nitrogen
donot have significant effect on dry weight of maize at 30 DAS. The treatment receiving
N200Z7.5 (nitrogen @ 200 kg ha-1
+ zeolite @ 7.5 t ha-1
) registered highest dry matter at 60,
90 DAS and at harvest. The grain yield of maize was significantly improved by application
of different combinations of nitrogen and zeolite levels. Among all the treatments, N200Z7.5
(Nitrogen @ 200 kg ha-1 + Zeolite @ 7.5 t ha-1
) resulted in higher grain yield (46.80 g pot1
) which was on par with N200Z5 (Nitrogen @ 200 kg ha-1 + Zeolite @ 5 t ha-1
) where the
grain yield recorded was 45.35 g pot-1
. The stover yield was highest in in N200Z7.5 (49.73 g
pot-1
) treatment which was on par with N200Z5 (Nitrogen @ 200 kg ha-1 + Zeolite @ 5 t ha-1
)
where the stover yield recorded was 48.19 g pot-1
. There was no significant influence of
zeolite, nitrogen and their interaction on test weight of maize.
Application of zeolite in combination with nitrogen increased growth, yield, nutrient
uptake and NUE of maize and also improved soil properties and the results indicated that
combination of zeolite and nitrogen (urea) to soil is better as compared to application of
urea alone.
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