Advances in Agronomy, Volume 171, the latest release in this leading reference, contains a variety of updates and new advances in the field, including updates on Elevated CO2 in Semi-arid Cropping Systems: A Synthesis of Research from the Australian Grains Free Air CO2 Enrichment (AGFACE) Research Program, Simultaneous Effects of Legume Cultivation on Carbon and Nitrogen Accumulation in Soil, Growing Small Grains Organically in the Semiarid West: A Review of Markets and Management Practices to Optimize Productivity and Sustainability, Principles and Applications of Topography in Precision Agriculture, Retention of Heavy Metals by Dredged Sediments and their Management Following Land Application, and more. Other chapters focus on Genetic Diversity for Developing Climate-resilient Wheats to Achieve Food Security Goals and A Century of Subclover: Lessons for Sustainable Intensification from a Historical Review of Innovations in Subterranean Clover Seed Production.