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Abstract: Land-use intensification poses one of the most critical environmental challenges of the 21st century, severely altering local biodiversity and disrupting ecosystem processes. My lab examines how intensified land use, particularly through excessive agrochemical applications, shapes microbial biogeography and spatiotemporal dynamics, and how that in turn impacts microbial contributions to agricultural productivity and soil health. To gain a regional-scale understanding, my lab has led one of the most comprehensive agricultural microbiome initiatives, creating a rich database of North Dakota’s edaphic and biological attributes. We conducted an extensive survey, collecting nearly 2,000 plant and soil samples from 201 agricultural fields across 51 of the state’s 53 counties. Our survey differs from the typical large-scale surveys because it sampled three important crop developmental phases from seedling to maturation to harvest while working with more than 100 producers across the state as well as all seven research extension centers (RECs) of NDSU. Our research generated a dataset containing more than 300,000 microbial ASVs and 200 environmental variables (e.g., soil, climate, and management data) as well as 60,000 assessments of beneficial mycorrhizal fungi which established itself as one of the largest worldwide collections. In my presentation, I will share insights from this project.