Cover: Fields of cereals, oilseeds, and pulse crops in the northern Great Plains near Melfort, SK, Canada. Adaptation of a wide range of crops in the rotation by farmers has been critical to ensuring agronomic and economic sustainability. See Johnston et al., "Oilseed Crops for Semiarid Cropping Systems in the Northern Great Plains," p. 231-240. This paper is part of the symposium papers in this issue that start on page 173. Photo by Adrian Johnston.