The Phosphorus Cycle by Michigan State University Extension, East Lansing, Michigan, U.S.A..
Links for The Phosphorus Cycle:
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https://www.canr.msu.edu/western_lake_erie_basin/phosphorus
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Phosphorus Cycle by the Southwest Research and Outreach Center, University of Minnesota, Lamberton, Minnesota, U.S.A..
https://swroc.cfans.umn.edu/agricultural-programs/soil-science/phosphorus-cycle -
Phosphorus Cycle by The Environmental Literacy Council, Washington, DC, U.S.A..
https://enviroliteracy.org/air-climate-weather/biogeochemical-cycles/phosphorus-cycle/ -
The phosphorus cycle by The Science Learning Hub, a national project designed to support the effective teaching of science in New Zealand schools.
https://www.sciencelearn.org.nz/resources/961-the-phosphorus-cycle -
Phosphorous Cycling in Agriculture by Amy L. Shober, Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware, U.S.A..
http://extension.udel.edu/factsheets/phosphorus-cycling-in-agriculture/ -
The Phosphorus Cycle: An Introduction by Heather MacNeill Falconer, M.A./M.S. at Visionlearning.com, your insight into science.
https://www.visionlearning.com/en/library/Earth-Science/6/The-Phosphorus-Cycle/197 -
Phosphorus cycle by Wikipedia, the free encyclopedia.
https://en.wikipedia.org/wiki/Phosphorus_cycle
