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The Science of the Total Environment|September 3, 2015
Trace elements in rock phosphates and P containing mineral and organo-mineral fertilizers sold in GermanySylvia Kratz, Judith Schick, Ewald SchnugJournal of Environmental Quality|September 10, 2004
Changes in soil nitrogen and phosphorus under different broiler production systemsSylvia Kratz, Jutta Rogasik, Ewald SchnugPageof 1