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1. Nitrogen Fertilization and Long-term No-tillage Impacts on Soil Properties and Deep Soil C Storage Under IrrigationThe net soil greenhouse gas mitigation potential of conservation agricultural management practices is strongly influenced by the direction and magnitude of soil organic C (SOC) change in deep soil layers (>6”). Deep SOC is typically old, highly processed, and consists of microbial products and root exudates associated with clay and other minerals. However, it can be susceptible to decomposition and priming from the addition of new, labile organic C. We examined long-term soil C dynamics... C. Stewart, D. Manter, J. Delgado, S. Del Grosso, F. Calderon, K. Heckman, K. Snell |
2. Legacy Impacts of Cattle Grazing on Soil N2O and CH4 Fluxes in Shortgrass SteppeGrazing cattle directly emit CH4 from enteric fermentation and contribute to soil N gas emissions related to nitrogen and organic matter additions from urine and manure deposits. Grazed soils can be sources or sinks of CH4, depending on moisture levels and localized manure patches. N2O emissions are related to availability of water as well as mineral N and labile C substrates in soil. Previously, we observed higher N2O and NH3 losses from fresh patches of urine and manure compared to... S. Del Grosso, J. Derner, J. Delgado |
3. Preserving the Past, Nurturing the Future: Inorganic Fertilizers and the Vital Role of Phosphorus and Potassium in Native Prairie RestorationPhosphorus (P) and potassium (K) are macronutrients required to sustain plant growth and reproduction. They are commonly applied as inorganic fertilizer by farmers across the world for their crops but these nutrients are also important for the development and sustainment of native grassland systems. Much of the Great Plains region has either been used as farmland or grazing land. These practices can disturb natural nutrient cycling by removing nutrients without adequate replacement. Current literature... K. Hays, B. Arnall |
4. Impacts of Crop Management on Grain Yield, Grain Quality, Cover Crop Biomass, Residue Cover, and Residual Nitrogen in Dryland SystemsCrop production depends on interactions among management practices, yet most studies evaluate the effect of individual practices rather than their interaction. This field experiment was established in 2024 at the Kansas State University Harold and Olympia Lonsinger Sustainability Farm (Osborne County, Kansas) to assess how combinations of common practices affect crop productivity and soil properties in a dryland system Treatments were a factorial combination of crop rotations (continuous... J. Schwartze, D. Ruiz Diaz, A. Obour, J. Holman, O. Brian, M. Reiman, A. Rosa |