Dynamics of Soil Organic Carbon and Their Fractions Under Different Cropping Systems in Hill Zone Acid Soils of Karnataka
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Author: Prabhudev Dhumgond, S.S. Prakash, T.S. Punith Raj, Sharan Bhoopal Reddy and K.M. Shivakumar,
p-ISSN: 0024-9602, e-ISSN:2582-5321, Vol: 99, Issue: oct-dec,
DOI:https://doi.org/10.29321/MAJ.10.100190
Abstract
Soil organic carbon (SOC) and its different labile fractions are important in minimizing negative
environmental impacts and improving soil quality. Thus it is very important to understand the
fractions of soil organic carbon and their distribution in different cropping systems. Soil
characterization revealed that soils were slightly acidic to moderately acidic in range with low
soluble salts. Soil under coffee and areca system recorded significantly higher SOC, TOC and
TN content compared to paddy system. The SMB-C, SMB-N, LFC and DOC were higher in
coffee and areca cropping systems compared to paddy system. The correlation between
SOC with TOC, TN, LFC, DOC, MBC and MBN was positive and significant. Light fraction organic
carbon showed positive and significant correlation with DOC, MBC and MBN. Regression
analysis suggests that SOC and LFC could explain 85% (R2
=0.853**) and 44% (R 2
=0.448*) variation
respectively in surface TOC concentration.
Keywords: Cropping system, SOC, DOC, LFC, MBC and MBN
