57 Symposium--Management Practices Inpact on Soil Nitrogen Conservation

Oral Session
Special Sessions
It has been known that crops are able to use only 50-70% of the applied N fertilizer.  Residual soil N after crop harvest is lost through volatilization, leaching, denitrification, or greenhouse gas (N2O) emissions. Opportunities exist to improve crop N-use efficiency and reduce the environmental impact of N fertilization.  This symposium will elucidate our current state of knowledge on N dynamics in agroecosystems. An increase in soil N storage can reduce N losses through leaching, volatilization, denitrification, surface runoff, erosion, and N2O emissions. Since N can also be mineralized from crop residue and soil, information on N storage and mineralization is needed to optimize N availability for crops , increase N-use efficiency, sustain crop yields and quality, and reduce N fertilization rate and the potential for N loss. Management practices are needed to conserve soil N and reduce N losses through soil processes. At the same time, a balance between N conservation and mineralization is also needed to optimize soil N availability that can sustain crop yields and quality and reduce the cost and rates of N fertilization. The objectives of this symposium are to: (1) discuss soil N conservation, N mineralization, and N balance, (2 reduce N fertilizer rates and improve N use efficiency, and (3) identify management practices that conserve soil N and reduce N losses.

Soil & Water Management & Conservation
Soil Fertility & Plant Nutrition
Nutrient Management & Soil & Plant Analysis
Soils & Environmental Quality
Agronomic Production Systems
Environmental Quality

Nutrients and Environmental Quality Community

Monday, November 3, 2014: 12:55 PM-3:45 PM
Long Beach Convention Center, Room 102A

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Upendra M Sainju
Upendra M Sainju
12:55 PM
Introductory Remarks
1:00 PM
Management Practices to Increase Nitrogen Retention and Decrease Losses in Agricultural Systems.
David S. Powlson, Rothamsted Research; Keith W.T. Goulding, Rothamsted Research; Andrew J. Macdonald, Rothamsted Research; Paul R. Poulton, Rothamsted Research; Chris van Kessel, University of California-Davis
1:20 PM
Nitrogen Conservation in High-Input Low Diversity and Low-Input High Diversity Agroecosystems.
Michael J Castellano, Iowa State University; Matt Liebman, Iowa State University; William R. Osterholz, Iowa State University; John E. Sawyer, Iowa State University; Fernando Miguez, Iowa State University
1:40 PM
2:00 PM
Response of Controlled Water Table Level and N-Fertilizer Rates on Yield of Potato.
Lincoln Zotarelli, University of Florida; Libby R Rens, University of Florida; Kelly Morgan, University of Florida; Diane L. Rowland, University of Florida; Ashok K. Alva, USDA-ARS; Guodong Liu, University of Florida
2:30 PM
2:45 PM
Nitrogen Cycling from Fall Applications of Biosolids to Winter Small Grains.
Kevin William Bamber, Virginia Tech; Gregory Evanylo, Virginia Tech; Wade E. Thomason, Virginia Tech
3:00 PM
Improved Nitrogen Application Methods and Fertilizer Additives to Reduce N Losses through Ammonia Voltilization, Nitrous Oxide Emissions and Nitrate Leaching.
Craig F. Drury, Agriculture & Agri-Food Canada; W. Daniel Reynolds, Agriculture & Agri-Food Canada; Xueming Yang, Agriculture & Agri-Food Canada
3:15 PM
Water Movement, Nitrate Leaching, and Crop Performance in Cover-Cropped Subsurface Drip-Irrigated Processing Tomato-Corn Rotations.
Martin Burger, University of California-Davis; Ahmad B. Moradi, University of California; Matthew R. Dumlao, University of California-Davis; Thore Giegerich, Geisenheim University of Applied Sciences; Jan W. Hopmans, University of California-Davis; William R. Horwath, University of California-Davis; Wendy K. Silk, University of California-Davis; Juan Wang, University of California Davis
3:45 PM
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