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Assessment of Waste-Derived Biochars on the Health and Biological Activity of Soil
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Atrazine leaching from biochar-amended soils.

Kyle B Delwiche1, Johannes Lehmann, M Todd Walter

  • 1Cornell University, 222 Riley Robb Hall, Ithaca, NY 14850, United States.

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|October 17, 2013
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Summary

Biochar application can decrease the herbicide atrazine leaching in soil, especially in the field. However, soil heterogeneity and macropore flow may limit its effectiveness in reducing leaching.

Keywords:
AtrazineBiocharGroundwaterMacropore

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Area of Science:

  • Environmental Science
  • Soil Science
  • Agricultural Chemistry

Background:

  • Atrazine is a widely used herbicide and a significant water contaminant in the United States.
  • Biochar, a soil amendment, shows potential for sorbing organic compounds and reducing herbicide leaching.

Purpose of the Study:

  • To investigate the impact of biochar on atrazine leaching under varying soil conditions.
  • To compare biochar's efficacy with peat and a peat-biochar mixture.

Main Methods:

  • Laboratory experiments using homogenized and undisturbed soil columns.
  • Field experiments with acidified biochar and peat applications.
  • Analysis of atrazine concentrations in leachate and groundwater.

Main Results:

  • Biochar significantly reduced cumulative atrazine leaching by 52% in homogenized soil columns.
  • Field application of acidified biochar lowered peak groundwater atrazine concentrations by 53%.
  • Biochar was ineffective in undisturbed soil columns and peat-biochar mixtures; peat alone had no effect.

Conclusions:

  • Biochar application can potentially reduce peak atrazine leaching, particularly in field settings.
  • Heterogeneous soil conditions, such as preferential flow paths, can limit biochar's effectiveness.
  • Long-term efficacy of biochar for atrazine leaching reduction remains uncertain.