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Natural 13C abundance and soil carbon dynamics under long-term residue retention in a no-till maize system

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Title Natural 13C abundance and soil carbon dynamics under long-term residue retention in a no-till maize system
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Creator Not Available
 
Subject No-till, maize, soil organic carbon, nitrogen, carbon stabilization, 13C isotopic abundance
 
Description Not Available
Residue retention and reduced tillage are both conservation agricultural practices that may enhance
soil organic carbon (SOC) stabilization in soil. We evaluated the long-term effects of no-till (NT) and
stover retention from maize on SOC dynamics in a Rayne silt loam Typic Hapludults in Ohio. The
six treatments consisted of retaining 0, 25, 50, 75, 100 and 200% of maize residues on each 3 9 3 m
plot from the crop of previous year. Soil samples were obtained after 9 yrs of establishing the
experiment. The whole soil (0–10 and 10–20 cm of soil depths) samples under different treatments
were analysed for total C, total N, recalcitrant C (NaOCl treated sample) and 13C isotopic abundance
(0–10 cm soil depth). Complete removal of stover for a period of 9 yrs significantly (P < 0.01)
decreased soil C content (15.5 g/kg), whereas 200% of stover retention had the maximum soil C
concentration (23.1 g/kg). Relative distribution of C for all the treatments in different fractions
comprised of 55–58% as labile and 42–45% as recalcitrant. Retention of residue did not significantly
affect total C and N concentration in 10–20 cm depth. 13C isotopic signature data indicated that C4-C
(maize-derived C) was the dominant fraction of C in the top 0–10 cm of soil layer under NT with
maize-derived C accounting for as high as 80% of the total SOC concentration. Contribution of C4-C
or maize-derived C was 71–84% in recalcitrant fraction in different residue retained plots. Residue
management is imperative to increase SOC concentrations and long-term agro-ecosystem necessitates
residue retention for stabilizing C in light-textured soils.
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Date 2020-05-21T09:43:28Z
2020-05-21T09:43:28Z
2017-03-01
 
Type Book
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/36029
 
Language English
 
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Publisher Not Available