1. Pasture Systems and Watershed Management Research Unit United States Department of Agriculture, Agricultural Research Service (USDA‐ARS) University Park PA 16802 USA
2. Department of Civil, Architectural and Environmental Engineering Drexel University Philadelphia PA 19104 USA
3. Instituto Nacional de Investigación Agropecuaria (INIA), La Estanzuela Ruta 50, km 11.500 Colonia CP 70000 Uruguay
4. Soil Plant Nutrient Research Unit USDA‐ARS Fort Collins CO 80526 USA
5. IRI The Earth Institute at Columbia University 61 Route 9W Lamont Campus Palisades NY 10964‐8000 USA
6. Natural Resource Ecology Laboratory Colorado State University Fort Collins CO 80523 USA