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Soil Aggregation and Associated Organic Carbon as Affected by Long Term Application of Fertilizer and Organic Manures under Rice-Wheat System in Middle Gangetic Plains of India

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Title Soil Aggregation and Associated Organic Carbon as Affected by Long Term Application of Fertilizer and Organic Manures under Rice-Wheat System in Middle Gangetic Plains of India
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Creator Not Available
 
Subject Water stable aggregates; Soil organic carbon; Organic amendments; Rice-wheat cropping system
 
Description Not Available
The long-term impact of integrated nutrient management practices on soil organic carbon (SOC),
aggregate stability and distribution of C in different aggregate fractions were studied. The experiment is
being conducted in a sandy clay loam (Udic Ustrochepts) at Bihar Agricultural University, Sabour since
1984 under rice-wheat rotation. Changes in total water stable aggregates (WSA), mean weight diameter
(MWD), aggregate associated C and bulk soil C were measured. Application of 50%NPK+ 50% N
through FYM in rice, 100% NPK in wheat increased the SOC, WSA, MWD and associated C over the
control (no NPK fertilizer or organics). The SOC content in 0-15 cm soil layer increased from 3.6 g kg-1
under no-fertilizer (control) to 7.7 g kg-1 soil under the INM treatments. Macroaggregates constituted
37-60% of total WSA and the proportion of microaggregates ranged from 19 to 30%. Addition of FYM,
wheat straw and green manure increased macroaggregate fractions, with a concomitant decrease in
microaggregate fractions. Among the macroaggregates, 0.25-0.50 mm fraction constituted the largest
proportion and had higher C density compared to microaggregates. The MWD was significantly higher
in plots receiving 50%NPK+ 50% N through FYM in rice (1.36 mm), 100% NPK in wheat or 50%NPK+
50% N through CR in rice (1.28 mm), 100% NPK in wheat or 50%NPK+ 50% N through GM in rice
(1.29), 100% NPK in wheat (1.18mm) as compared to control (0.89 mm). It may be concluded that
application of 50%NPK+ 50% N through FYM in rice and 100% NPK in wheat can sustain the soil C in
a better way and contribute in mitigation of global warming.
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Date 2020-08-01T02:47:58Z
2020-08-01T02:47:58Z
2015
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/38757
 
Language English
 
Relation Not Available;
 
Publisher Not Available