Douglas Karlen

Affiliate
Doug.Karlen@ars.usda.gov


Office: 314 NLAE
Phone: (515) 294-3336
Fax: 5152948125



My soil and crop management research program uses a systems approach involving producers, action agencies, non-government organizations (NGOs), agribusiness, and other state and federal research partners to quantify the physical, chemical, and biological effects of conventional and organic farming practices. Effects of tillage, crop rotation, nutrient management, and other decision-based factors are evaluated by determining how they affect soil quality, crop productivity, plant nutrient availability, and nutrient or soil losses from various soil types and landscape positions.