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Cover: Close-up of charcoal produced by pyrolysis of agricultural manure and pine shavings. Charcoal, whether produced from wildfires or as a by-product of renewable energy production, is increasingly appreciated for its ability to affect a range of important biotic and abiotic soil properties and processes. Please see p. 1173–1181, “Effect of charcoal quantity on microbial biomass and activity in temperate soils” by Simone E. Kolb, Kevin J. Fermanich, and Mathew E. Dornbush. The photo was taken by Mike Heine, News and Media Relations Coordinator, University of Wisconsin-Green Bay.