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A Protocol for Collecting and Constructing Soil Core Lysimeters
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Trace element changes in soil after long-term cattle manure applications.

Mônica B Benke1, Srimathie P Indraratne, Xiying Hao

  • 1Agriculture and Agri-Food Canada, Lethbridge Research Centre, Lethbridge, Alberta, Canada.

Journal of Environmental Quality
|May 6, 2008
PubMed
Summary

Long-term cattle manure application significantly increases soil cadmium (Cd) and zinc (Zn) levels, with extractable forms posing potential risks. These trace element accumulations persist, even after manure application ceases.

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Soil Science

Background:

  • Manure application is a common agricultural practice for nutrient supply.
  • However, it can lead to the accumulation of trace elements in soil.
  • The long-term effects and residual impacts of manure on soil trace elements require thorough investigation.

Purpose of the Study:

  • To evaluate the impact of long-term annual manure applications on total and EDTA-extractable trace elements (B, Cd, Co, Cu, Zn) in soil.
  • To assess the residual effects of manure application on soil trace elements after a period of no application.
  • To determine if manure application leads to trace element accumulation exceeding regulatory limits.

Main Methods:

  • Investigated soil samples after 25 annual manure applications under rainfed and irrigated conditions.
  • Applied varying rates of cattle manure (0-90 Mg ha(-1) yr(-1) rainfed; 0-180 Mg ha(-1) yr(-1) irrigated).
  • Analyzed total and EDTA-extractable concentrations of Boron (B), Cadmium (Cd), Cobalt (Co), Copper (Cu), and Zinc (Zn).
  • Examined residual effects in plots with 14 years of manure followed by 11 years of no application.

Main Results:

  • Manure application did not significantly affect soil B, Cd, and Co levels.
  • Total Cu and Zn significantly increased under irrigated conditions, with Zn reaching European Community Maximum Allowable Concentration (MAC) levels at higher rates.
  • EDTA-extractable Cd and Zn significantly increased, with substantial proportions found in extractable forms.
  • Elevated EDTA-extractable Cd and Zn were also observed in residual plots, indicating long-lasting effects.

Conclusions:

  • Long-term cattle manure application significantly increases soil total and extractable Zn and Cd concentrations, particularly under irrigated conditions.
  • The accumulation of these trace elements, especially extractable Cd and Zn, poses potential environmental and health concerns.
  • The observed effects are long-lasting, highlighting the need for careful manure management to prevent soil contamination.