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Soil carbon fractions under maize–wheat system: effect of tillage and nutrient management

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Title Soil carbon fractions under maize–wheat system: effect of tillage and nutrient management
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Creator S. Sandeep
K. M. Manjaiah
Sharmistha Pal
A. K. Singh
 
Subject Maize–wheat cropping system Walkley and Black carbon. KMnO4 -oxidizable carbon Microbial biomass carbon Carbon management index
 
Description Not Available
Soil organic carbon plays a major role in
sustaining agroecosystems and maintaining environmental
quality as it acts as a major source and sink of
atmospheric carbon. The present study aims to assess
the impact of agricultural management practices on soil
organic carbon pools in a maize–wheat cropping system
of Indo-Gangetic Plains, India. Soil samples from a split
plot design with two tillage systems (bed planting and
conventional tillage) and six nutrient treatments (T=control, T2=120 kg urea–Nha -1,T3=T2(25 % N)
substituted by FYM), T4=T2(25 % N substituted bysewage sludge), T5=T2+cropresidue, T=100%organic
source (50 % FYM+25 % biofertilizer+25 % crop residue)
were used for determining the organic carbon pools.
Results show that there was a significant improvement in
WalkleyandBlackcarboninsoilunderintegratedand
organic nutrient management treatments. KMnO4 -oxidizable
carbon content of soil varied from 0.63 to 1.50 g kg-1
in soils and was found to be a better indicator
for monitoring the impact of agricultural management
practices on quality of soil organic carbon than microbial
biomass carbon. Tillage and its interaction were found to
significantly influence only those soil organic carbon
fractions closely associated with aggregate stability viz,
labile polysaccharides and glomalin. The highest amount
of C4-derived carbon was found to be in plots receiving
recommended doses of N as urea (29 %) followed by
control plots (25 %). The carbon management index
ranged between 82 to 195 and was better in integrated
nutrient sources than ones receiving recommended doses
of nutrients through mineral fertilizers alone.
Not Available
 
Date 2020-06-03T12:10:06Z
2020-06-03T12:10:06Z
2015-11-20
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/36821
 
Language English
 
Relation Not Available;
 
Publisher Not Available