The global expansion of irrigated lands during the 20th century and beyond continues to contribute to food production, but also degrades the environment significantly. The consequent search for policy remedies has stimulated a vital body of economic research. The issues addressed in this comprehensive collection of previously published articles include the effects of existing government intervention on the environmental impacts of agriculture, the economic costs and benefits of environmental regulations for agriculture, and the economic and environmental merits of alternative mechanisms for water allocation and water quality protection. In this volume the editors present a sampling of economic research on the interface of irrigated agriculture with the environment. The articles included are by leading researchers in this field and span the topics of nonpoint pollution control, salinity management, and the allocation of water.