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EFFECT OF MOISTURE LEVELS AND COATED UREA FERTILIZERS ON RELEASE PATTERN OF NITROGEN IN AN ALFISOL AND VERTISOL

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Title EFFECT OF MOISTURE LEVELS AND COATED UREA FERTILIZERS ON RELEASE PATTERN OF NITROGEN IN AN ALFISOL AND VERTISOL
 
Creator ANUDEEP NAIDU, K
 
Contributor PADMAJA, G
 
Subject enzymes, livestock, humus, animal tissues, public sector, biological phenomena, sexual reproduction, marketing, inorganic acid salts, adenine
 
Description The present investigation entitled “Effect of Moisture Levels and Coated Urea
Fertilizers on Release Pattern of Nitrogen in an Alfisol and Vertisol” was carried out
under laboratory conditions at 35±0.5 0C with a view to study the release pattern of
nitrogen from different coated urea fertilizers (NCCU, VCU, HCU, PU and Control) at two
moisture levels i.e., FC and SAT, in two different soils viz., an Alfisol and a Vertisol. The
transformation of N-fractions was studied to know the form in which the N is available
under varying moisture levels at different days of incubation viz., 0, 1, 3, 5, 7, 10, 15, 30,
45, 60, 75 and 90 days. The experiment was conducted in completely randomized block
design with factorial concept.
The Alfisol was clay loam in texture, slightly alkaline (pH 7.91) in reaction, nonsaline
(0.59 dS m-1) in nature and high in organic carbon (0.76 %), low in available
nitrogen (200.7 kg N ha-1) and phosphorus (21.53 kg P2O5 ha-1) and high in potassium
(343.8 kg K2O ha-1). The NH4
+-N and NO3
--N contents were 11.2 and 18.2 mg kg-1,
respectively. Vertisol was silty clay loam in texture, moderately alkaline (pH 8.01) in
reaction, non-saline (0.51 dS m-1) in nature and medium in organic carbon (0.62 %), low in
available nitrogen (225.8 kg N ha-1) and phosphorus (17.86 kg P2O5 ha-1) and high in
potassium (548.8 kg K2O ha-1). The values of NH4
+-N and NO3
--N contents found to be
15.4 and 23.8 mg kg-1, respectively.
The different coated urea fertilizers were evaluated in terms of release pattern of
NH4
+-N and subsequent NO3
--N formation at 0, 1, 3, 5, 7, 10, 15, 30, 45, 60, 75 and 90
days after incubation. The incubated soil samples were analyzed for their inorganic N
fractions viz., NH4
+-N and NO3
--N at respective days after incubation.
The results of the experiment revealed that irrespective of the coated urea fertilizers
there was significantly higher amount of NH4
+-N released under SAT as compared to FC.
Similarly, there was significantly higher NO3
--N release under FC as compared to SAT, in
both Alfisol and Vertisol.
With regard to coated urea fertilizers irrespective of the moisture levels, T4 (PU)
hydrolyzed rapidly releasing highest NH4
+-N content within 7 DAI in both Alfisol (402.6
mg kg-1) and Vertisol (417.6 mg kg-1). This was followed by T3 (HCU) reaching highest
NH4
+-N content at 15 DAI (406.7 mg kg-1) and 10 DAI (412.0 mg kg-1) in Alfisol and
Vertisol, respectively. Whereas with NCCU and VCU, the NH4
+-N contents at 10 DAI
found to be 395.3 and 389.9 mg kg-1 in Alfisol and 414.8 and 404.6 mg kg-1 in Vertisol,
respectively.
Nitrification of NH4
+-N to NO3
--N was rapid with PU, releasing higher NO3
--N at 45
DAI from Alfisol (327.5 mg kg-1) and Vertisol (346.5 mg kg-1) and thereafter remained
more or less similar. For T1, T2 and T3 the highest NO3
--N contents were recorded at 75
DAI. The release of NO3
--N followed the order NCCU< VCU< HCU< PU. The onset of
nitrification led to decrease in NH4
+-N content of the soils.
The interaction effects revealed that the release of NH4
+-N was significantly slower
under FC as compared to SAT. The release of NO3
--N showed a quick increase from 30 to
90 DAI, the highest values being recorded at FC.
Keeping in view the release patterns and mineralization of NH4
+-N and NO3
--N in
both Alfisol and Vertisol, under the two moisture levels, NCCU was identified as best
coated urea fertilizer followed by VCU and HCU in maximizing the N-availability over a
period of time.
 
Date 2016-06-13T12:05:08Z
2016-06-13T12:05:08Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67252
 
Language en
 
Relation D9306;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY