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Cover: Seedling emergence is the crucial first step in crop establishment; however, crops frequently must penetrate or lift a thin, dense, soil layer called a crust, which is formed by drop impact or aggregate slaking during rainstorms and sprinkler irrigation. See "Seedbed Surface Geometry Effects on Soil Crusting and Seedling Emergence," by Baumhardt et al., p. 1112-1117. Photo by Paul W. Unger.