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This issue's cover: These images show corn (Zea mays L.) grown on alluvium-derived soils of the Zuni Indian Reservation in New Mexico. Archaeological and historical evidence suggests that fields like the one in the background image have been farmed more or less continuously for over 1000 years. In traditional non-irrigated crop production in this semiarid environment, Zuni farmers do not use soil amendments but rely on watershed transport and deposition processes for productivity maintenance and renewal. Please see “Organic matter transformations through arroyos and alluvial fan soils within a Native American agroecosystem” by J.B. Norton, J.A. Sandor, C.S. White, and V. Laahty, pages 829–835.