Nitrogen use efficiency and cycling in pastures managed with reduced nitrogen inputs
Nitrogen use efficiency and cycling in pastures managed with reduced nitrogen inputs
Tuesday, November 17, 2015: 8:15 AM
103 A (Convention Center)
Increasingly, management strategies that reduce N fertilizer inputs are emphasized to enhance N use efficiency, reduce N losses, and improve pasture grazing economics. In 2005, a long-term experiment was initiated at the Univ. of Nebraska-Lincoln to evaluate beef cattle performance and N cycling in 1) N-fertilized pasture grazed with unsupplemented beef cattle (FERT); 2) unfertilized pasture grazed with unsupplemented beef cattle (CONT); and 3) unfertilized pasture grazed with dried distillers grains plus solubles (DDGS)-supplemented beef cattle (SUPP). Research partners included agricultural economists, animal scientists, ecologists, and soil scientists. Across the 10-yr experiment, the research showed steers in SUPP had better body weight gains and used N more efficiently than steers in CONT and FERT, and SUPP produced greater economic returns because of reduced N fertilizer costs and improved animal performance. Cessation of annual N fertilization in CONT and SUPP, however, decreased annual herbage accumulation, litter deposition, and root and rhizome mass, soil N mineralization and litter decomposition compared to FERT, indicting the importance of N fertilization to sustaining pasture productivity.The accumulation of these results also shows that importance of partnering and long-term experiments to further understanding of nutrient cycles in managed grassland ecosystems.
See more of: Joint Symposium: Partnering to Understand Complexity: Biogeochemical Cycles in Agricultural Systems
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