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Phosphates in agriculture.

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The Nitrogen and Phosphorus Knowledge Web page is offered by Iowa State University Extension and the College of Agriculture. The publications page contains links to various newsletters, articles, publications, power point presentations, links to governmental publications, and more. For example, visitors will find articles written on phosphorous within the Integrated Crop Management Newsletter,...

http://extension.agron.iastate.edu/NPKnowledge/pubs.shtml