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Paddy and Water Environment

, Volume 10, Issue 2, pp 95–102 | Cite as

Soil organic carbon sequestration as affected by tillage, crop residue, and nitrogen application in rice–wheat rotation system

  • Rajan Ghimire
  • Keshav Raj AdhikariEmail author
  • Zueng-Sang Chen
  • Shree Chandra Shah
  • Khem Raj Dahal
Article

Abstract

Despite being a major domain of global food supply, rice–wheat cropping system is questioned for its contribution to carbon flux. Enhancing the organic carbon pool in this system is therefore necessary to reduce environmental degradation and maintain agricultural productivity. A field experiment (November 2002–March 2006) evaluated the effects of soil management practices such as tillage, crop residue, and timing of nitrogen (N) application on soil organic carbon (SOC) sequestration in the lowland of Chitwan Valley of Nepal. Rice (Oryza sativa L.) and wheat (Triticum aestivum L.) were grown in rotation adding 12 Mg ha−1 y−1 of field-dried residue. Mung-bean (Vigna radiata L.) was grown as a cover crop between the wheat and the rice. Timing of N application based on leaf color chart method was compared with recommended method of N application. At the end of the experiment SOC sequestration was quantified for five depths within 50 cm of soil profile. The difference in SOC sequestration between methods of N application was not apparent. However, soils sequestered significantly higher amount of SOC in the whole profile (0–50 cm soil depth) with more pronounced effect seen at 0–15 cm soil depth under no-tillage as compared with the SOC under conventional tillage. Crop residues added to no-tillage soils outperformed other treatment interactions. It is concluded that a rice–wheat system would serve as a greater sink of organic carbon with residue application under no-tillage system than with or without residue application when compared to the conventional tillage system in this condition.

Keywords

Conventional tillage Crop residue No-tillage Organic carbon Rice–wheat crop rotation Soil depth 

Notes

Acknowledgments

The authors are grateful to professor Dr. John M. Duxbury and senior research associate Dr. Julie G. Lauren of the Soil Management and Collaborative Research Support Program (SM-CRSP) of Cornell University, USA for providing financial support and the necessary technical guidance for this study.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Rajan Ghimire
    • 1
  • Keshav Raj Adhikari
    • 2
    Email author
  • Zueng-Sang Chen
    • 2
  • Shree Chandra Shah
    • 1
  • Khem Raj Dahal
    • 1
  1. 1.Institute of Agriculture and Animal Sciences (IAAS)Tribhuvan UniversityChitwanNepal
  2. 2.Department of Agricultural ChemistryNational Taiwan UniversityTaipeiTaiwan

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