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1. Tillage and Nitrogen Rates Influenced Wheat and Sorghum ProductivityReduced tillage (RT) or no-tillage (NT) practices and reducing fallow frequency can both decrease soil losses from wind erosion and conserve soil water in the semiarid regions of the US Great Plains. This study evaluated sorghum grain yield in 2013 and wheat grain yield in 2014 and 2015 as influenced by long-term nitrogen (N) fertilizer application rates (0, 20, 40, and 60 lb N ac- 1) and tillage intensity [clean tillage (CT), RT, and NT] in dryland winter wheat–sorghum-fallow (W-S-F) cropping... M. Mikha |
2. Carbon and Nitrogen Cycling in High-Elevation Hay Meadows: Understanding Processes for Improved Agroecosystem ProductivityIrrigated hay meadows are an integral, but often under-performing component of livestock operations in western rangeland ecosystems. Flood irrigation resulting in seasonal saturation, high elevation, and cool temperatures common to these systems result in concentration of organic materials near the soil surface, constraining nitrogen cycling, forage productivity and diversity. Improved understanding of nutrient cycling, soil organic matter processes, and ecosystem services of irrigated hay meadows,... D. Adamson, J. Norton |