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Simulating change in soil organic carbon in two long term fertilizer experiments in India : with the RothC model

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Title Simulating change in soil organic carbon in two long term fertilizer experiments in India : with the RothC model
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Creator Bhattacharyya, T., Pal, D.K., Ray, S.K., Chandran, P., Mandal, C., Telpande, B., Deshmukh, A.S. and Tiwary, P.
 
Subject Global Warming, RothC, Total Organic Carbon, Long Term Fertilizer Experiment
 
Description Not Available
Global importance of total organic carbon (TOC)
in soil is due to its role in the global carbon cycle and, thus,
the part it plays in influencing the atmospheric levels of
greenhouse gases (GHGs). It is also of local importance as
it determines ecosystem and agro-ecosystem function,
influencing various soil parameters. The objective of the
present study was to evaluate RothC model (26.3) to estimate
TOC changes under two long term fertilizer experimental
(LTFE) sites representing humid (Mohanpur) and semi-arid
(Akola) climate in India. Five treatments each at the LTFE
sites of Mohanpur representing alluvial soils (Alfisol) of the
Indo-Gangetic Plains (IGP) and of Akola dominated by black
soils (Vertisols) in the Black Soil Region (BSR) were
selected. Mohanpur site was modelled for 3 layers (0-13,
13-23, and 23-39 cm) while Akola for surface layer (0-15
cm) only. The root mean square error (RMSE), considered
as modelling error, ranged from 3.34 to 17.85%, 6.87 to
14.22% and 6.66 to 24.34% in the 3 soil layers of Mohanpur
site respectively. For Akola, RMSE ranges from 1.79 to
13.28. The simulation biases expressed by M (relative error)
for all treatments at these sites were non-significant. In
Mohanpur, observed trends in TOC show marginal increase
in control (T1) and 100% NPK (T2) while the increase was
nearly 17 to 35% when organic amendments were applied
along with inorganics during 1999 to 2010. For the same
period in Akola, control (T1), 50% NPK (T2), and 100%
NPK (T4) recorded decrease in TOC while 26 to 29%
increase was registered without inorganics and with the
combination of inorganics and organics respectively. The
calculation of modelled TOC stock to find out effect of global
warming indicated that treating the entire soil pedon as a
homogenous unit will overestimate effects of global warming
in accelerating decomposition of soil carbon.
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Date 2020-05-26T10:22:01Z
2020-05-26T10:22:01Z
2013-10-31
 
Type Research Paper
 
Identifier Bhattacharyya, T., Pal, D.K., Ray, S.K., Chandran, P., Mandal, C., Telpande, B., Deshmukh, A.S. and Tiwary, P. (2013) Simulating change in soil organic carbon in two long term fertilizer experiments in India : with the RothC model, Climate Change and Environmental Sustainability, October 2013, 1(2): 104-117
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http://krishi.icar.gov.in/jspui/handle/123456789/36301
 
Language English
 
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Publisher Not Available