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Soil and RootsArticle: Soil Compaction Stress & Trees: Symptoms, Measures, Treatments by Dr. Kim Coder, University of Georgia Warnell School of Forestry and Natural Resources [December 2007] Article: "Diagnosing Soil Compaction Using a Penetrometer (soil compaction tester)" by Sjoerd W. Duiker, Pennsylvania State University College of Agricultural Sciences [added July 14, 2014] |