Alum reduced phosphorus release from flooded soils under cold spring weather conditions.

Autor: Lasisi A; Department of Environmental Studies and Sciences, The University of Winnipeg, Winnipeg, Manitoba, Canada.; Swift Current Research and Development Centre, Agriculture and Agri-Food Canada, Swift Current, Saskatchewan, Canada., Weerasekara CS; Department of Environmental Studies and Sciences, The University of Winnipeg, Winnipeg, Manitoba, Canada.; Department of Soil Science, University of Manitoba, Winnipeg, Manitoba, Canada., Kumaragamage D; Department of Environmental Studies and Sciences, The University of Winnipeg, Winnipeg, Manitoba, Canada.; Department of Soil Science, University of Manitoba, Winnipeg, Manitoba, Canada., Akinremi OO; Department of Soil Science, University of Manitoba, Winnipeg, Manitoba, Canada.
Jazyk: angličtina
Zdroj: Journal of environmental quality [J Environ Qual] 2023 May-Jun; Vol. 52 (3), pp. 718-729. Date of Electronic Publication: 2023 Mar 30.
DOI: 10.1002/jeq2.20469
Abstrakt: The effectiveness of amendments such as alum [Al 2 (SO 4 ) 3 ·18H 2 O] in reducing phosphorus (P) loss to floodwater has been reported under summer conditions and laboratory-controlled environments, but not under actual spring weather conditions in cold climate regions with high diurnal temperature variations when potential for P losses is high. The effectiveness of alum in reducing P release under Manitoba spring weather conditions was evaluated in a 42-day experiment using 15-cm soil monoliths from eight agricultural soils, which were unamended or alum-amended (5 Mg ha -1 ) and flooded to a 10-cm head. Dissolved reactive P (DRP) concentrations and pH of porewater and floodwater were determined on flooding day and every 7 days after flooding (DAF). Porewater and floodwater DRP concentrations in unamended soils increased 1.4- to 4.5-fold, and 1.8- to 15.3-fold, respectively, from 7 to 42 DAF. In alum-amended soils, DRP concentrations averaged across soils was 43%-73% (1.0-2.0 mg L -1 ) lower in porewater, and 27%-64% (0.1-1.2 mg L -1 ) lower in floodwater than unamended soils during the flooding period. The reduction of DRP by alum was more pronounced under high fluctuating diurnal spring air temperature than with controlled air temperature (4°C) in a previous similar study. Acidic pH in porewater and floodwater due to alum did not persist over 7 days. This study showed that alum application is a viable option in reducing P released to floodwater in agricultural soils of cold regions where flooding-induced P loss is prevalent in the spring.
(© 2022 The Authors. Journal of Environmental Quality published by Wiley Periodicals LLC on behalf of American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.)
Databáze: MEDLINE
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