EGU2020-11873
https://doi.org/10.5194/egusphere-egu2020-11873
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Soil amendments reduce P release from flooded soils: Incubation studies simulating snowmelt and summer flooding

Chammi Attanayake1,2, Darshani Kumaragamage2, Chamara Weerasekara3, Udaya Vitharana1, Saman Dharmakeerthi1, Emily Van4, Doug Goltz4, and Srimathie Indraratne2
Chammi Attanayake et al.
  • 1Department of Soil Science, University of Peradeniya, Peradeniya, Sri Lanka (chammiattanayake@gmail.com)
  • 2Department of Environmental Studies and Sciences, The University of Winnipeg, Winnipeg, Canada (d.kumaragamage@uwinnipeg.ca)
  • 3Department of Soil Science, University of Manitoba, Winnipeg, Canada (imbulcsw@myumanitoba.ca)
  • 4Department of Chemistry, The University of Winnipeg, Winnipeg, Canada (van-e@webmail.uwinnipeg.ca)

Flooding caused by snowmelt runoff in the spring and early summer and heavy rainfall in the summer could enhance P release into nearby surface water bodies causing eutrophication. Six soil amendments were tested for their effectiveness  in reducing P release from flooded-soils. Soils were collected from the flood-prone fields in the Red River Valley region in Manitoba, Canada. The tested amendments were gypsum, magnesium sulphate, alum, ferric chloride, zeolite and manganese oxides. Intact soil columns were subjected to flooding for 8 weeks at 4oC simulating the snowmelt in the spring and the early summer and at 22oC simulating flooding occurrences in the summer.  Release of soil P into soil solution and floodwater was higher at 22oC than that at 4oC. Gypsum, magnesium sulphate, alum and ferric chloride were effective in reducing the concentrations of P in the pore- and flood-water at various capacities. Ongoing research on zeolite and manganese oxide suggests that manganese oxide was more effective in reducing soluble P concentrations in soils at early days of flooding.

How to cite: Attanayake, C., Kumaragamage, D., Weerasekara, C., Vitharana, U., Dharmakeerthi, S., Van, E., Goltz, D., and Indraratne, S.: Soil amendments reduce P release from flooded soils: Incubation studies simulating snowmelt and summer flooding, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-11873, https://doi.org/10.5194/egusphere-egu2020-11873, 2020

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I added one sentence in the Acknowledgement slide
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