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Soil and residue carbon mineralization as affected by soil aggregate size

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Title Soil and residue carbon mineralization as affected by soil aggregate size
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Creator Pramod Jha , Nikita Garg , Brij Lal Lakaria, A.K. Biswas , A. Subba Rao
 
Subject Soil aggregates Soil carbon mineralization Residue carbon mineralization Soil carbon pools
 
Description Not Available
The nature of the contact between fresh organic matter and soil depends mainly on the characteristics of
the plant residues and on the physical properties of the soil. In a cultivated cropping system, changes in
soil organic C cannot be entirely attributed to changes in organic matter input. Breakdown of aggregates
caused by cultivation not only affects soil organic matter but also influences the rate of mineralization of
added organic matter. Many models simulating organic matter decomposition in the field are calibrated
with laboratory data from experiments where crop residues are ground and mixed homogeneously with
soil aggregates. In the present study, soil aggregate size was used as a means of varying the contact
between crop residue and the soil. The results demonstrated that cumulative soil carbon mineralization
from different aggregates had a significant (r = 0.60, p = 0.05) and positive relationship with their
oxidizable soil carbon content. Residue carbon mineralization in different aggregate size classes was
inversely related to aggregate oxidizable soil carbon content (r = 0.95, p = 0.01), cumulative soil carbon
mineralization (r = 0.89, p = 0.01) and resistant soil carbon pool (r = 0.80, p = 0.01). Residue carbon
mineralization in different aggregate size classes was also inversely (r = 0.61, p = 0.05) related to the
active carbon content (KMnO4 oxidizable carbon) of the aggregates. There was no significant difference
in soil active carbon pool in different aggregate size classes. Determination of size and turnover of a slow
pool showed significant difference in different aggregate size classes. The slow carbon pool in different
aggregate size classes ranged from 13.7 to 25.5% with mean residence time of 1.8 to 5.4 years. Water
soluble carbon and active carbon (alkaline KMnO4 oxidizable C) were significantly higher in macroaggregates
than in micro-aggregates.
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Date 2020-05-21T09:43:06Z
2020-05-21T09:43:06Z
2012-01-01
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/36026
 
Language English
 
Relation Not Available;
 
Publisher Not Available