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EFFECT OF NANOCLAY- POLYMER COMPOSITES LOADED WITH UREA AND NITRIFICATION INHIBITORS ON NITRIFICATION IN SOIL

KrishiKosh

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Title EFFECT OF NANOCLAY- POLYMER COMPOSITES LOADED WITH UREA AND NITRIFICATION INHIBITORS ON NITRIFICATION IN SOIL
M.Sc.
 
Creator KIRTI SAURABH
 
Contributor K. M. Manjaiah
 
Subject NANOCLAY POLYMER COMPOSITES (NCPCs) LOADED UREA NITRIFICATION INHIBITORS NITRIFICATION SOIL
 
Description T-8829
In common fertilizer usage, the expected efficiency is approximately 30 – 70 % of
added nitrogen, but it is very often lower than 50 %. Loss of N from applied N
fertilizer has several possible negative agricultural and environmental consequences.
The combination of super absorbent polymer (SAP) and slow or controlled release
fertilizer in a single formulation may be an effective management practice to improve
water preservation and nutrient supply through one pack. In present investigation two
studies were undertaken viz., synthesis of nanoclay-polymer composites (NCPCs)
loaded with urea and nitrification inhibitors and their characterization and their
evaluation for nitrification inhibition activity. A series of poly (acrylic acid-coacrylamide)/
bentonite composites were prepared by partially neutralized acrylic acid
and acrylamide in the presence of bentonite nanopowder, using N,N’-
methylenebisacrylamide (MBA) as a crosslinker and ammonium persulfate (APS) as
an initiator. These NCPCs were swollen in aqueous solution of urea and nitrification
inhibitors for nutrient loading to act as a slow release carrier of urea. The prepared
NCPCs were characterised by SEM, TEM, FTIR, XRD, etc. The various
characterization methods suggested graft copolymerzation between clay and polymer,
which indicated that the clay dispersed into the polymer matrix and chemically
reacted with the polymers leading to the formation of NCPCs. Release of N from
nutrient loaded NCPC was carried out in distilled water and soil and a laboratory soil
column leaching study was done to work out the effectiveness of nutrient loaded
NCPCs over conventional fertilizer. It was observed that the release rate in water was
the highest during the first 7 days, and then reaches a plateau. In soil incubation study
of 120 days, per cent nitrification inhibition was highest in Schiff base containing
NCPCs. The results obtained regarding the movement of NH4
+ -N and NO3
- -N at
three different depths of the soil column showed that most of the NH4
+ ions from
CHAPTER VII
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NCPCs are retained in 0-5 cm of the soils but NO3
- ions moved out of it. The amount
of NH4
+ moving to the middle of the column (5-15 cm) decreased but NO3
- increased.
The leachates marked no NH4
+ and NO3
- ions in NCPCs. NCPC functions in delaying
the release of nitrogen and nitrification, thereby serving a novel slow release
nitrogenous fertilizer. So, this study could provide a convenient method for designing
and preparing superabsorbent nanoclay-polymer composites with suitable release
nitrogen rates to meet the requirements of the plant, and thus produce economic and
environmental benefits.
 
Date 2016-06-22T15:31:20Z
2016-06-22T15:31:20Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67752
 
Format application/pdf
 
Publisher IARI,Division of Soil Science & Agricultural Chemistry