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Soil aggregation and distribution of carbon in a sandy loam soil of Trans Gangetic plains under integrated nutrient management practices in rice-wheat cropping system

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Title Soil aggregation and distribution of carbon in a sandy loam soil of Trans Gangetic plains under integrated nutrient management practices in rice-wheat cropping system
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Creator Not Available
 
Subject Aggregate associated carbon, Organic amendments, Rice-wheat cropping system, Soil organic carbon, Structural indices, Water stable aggregates
 
Description Not Available
The effects of different integrated nutrient management practices on soil
aggregation, bulk density and aggregate associated carbon after 26 years of ricewheat
cropping system on a sandy loam soil of Ludhiana were studied. The total
Water Stable Aggregates (WSA) at wheat harvest ranged between 78.6 and 85.8%
under different treatments. Application of NPK either through inorganic fertilizers
or through combination of inorganic fertilizers and organics such as Farm Yard
Manure (FYM) or Crop Residue (CR), or Green Manure (GM) significantly increased
the amount of water stable aggregates, aggregate ratio, Mean Weight Diameter
(MWD) and Geometric Mean Diameter (GMD). The macro-aggregates comprised
35.3 to 48.9% of the total WSA compared to 36.5 to 43.3% as micro-aggregates. The
amount of macro-aggregates was lowest in the control plot and it was higher in the
plots treated with organics. Application of FYM, CR and GM significantly improved
the formation of macro-aggregates as compared to control. The proportion of
micro-aggregates decreased with the application of organics. Among the macroaggregates,
the 0.25-0.50 mm fraction constituted the greatest proportion (17-
21.6%). Plots receiving FYM showed the highest MWD (0.56 mm) and the control
plots had the lowest MWD (0.43 mm). Meagre variation was observed in all the
structural indices among the organically amended treatments. Carbon concentration
was higher in macro-aggregates as compared to micro-aggregates and application of
organics resulted in the greatest increase in C concentration in various aggregate size
fractions over control.
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Date 2020-08-01T02:47:35Z
2020-08-01T02:47:35Z
2017
 
Type Book
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/38756
 
Language English
 
Relation Not Available;
 
Publisher Not Available