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CONTACT INFORMATION
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Research Soil Scientist
Phone: 406.433.9402
Fax: 406.433.5038
E-mail: jwaddell[at]sidney.ars.usda.gov |
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EDUCATION |
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B.S. Agricultural
Chemistry |
1990 |
University of Maryland, College Park,
Maryland |
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M.S. Agronomy |
1991 |
University of Maryland, College Park,
Maryland |
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Ph. D. Soil Science |
1997 |
University of Minnesota, St. Paul,
Minnesota |
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RESEARCH EXPERIENCE |
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1990-1993 |
Research Assistantship in
Agronomy, University of Maryland |
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1993-1997 |
Research Assistant in Soil
Science, University of Minnesota |
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1997-1998 |
Post-doctoral Assistant in Soil
Science, University of Minnesota, St. Paul |
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1998-2004 |
Senior Scientist, Tetra Tech Inc.
Fairfax, VA |
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2004-Present |
Soil Scientist, USDA, ARS Northern
Plains Agricultural Research Lab |
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CURRENT
RESEARCH |
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 In
cooperation with Busch Agricultural Resources, Inc. (BARI) and Montana
State University, a project was initiated to further our understanding
on the effects of nitrogen fertilizer on the growth, yield, and quality
of malt-barley. Nutrient management is extremely important in
satisfying yield and end-use quality requirements for irrigated spring
barley. Inadequate nutrient levels lower yields. Excess nitrogen can
also decrease yields and quality and cause significant economic loss if
contract specifications are not met. Excessive plant tissue nitrogen
concentrations tend to promote vegetative growth, which increases the
potential for foliar diseases and promotes lodging by decreasing straw
strength. High soil nitrogen also increases the potential for
environmental degradation from nitrate leaching.
A nitrogen response
function was developed by using several nitrogen rates. Plant and soil
N samples were taken weekly during the growing season. These results
were compared to yield and end-use quality to evaluate sufficiency
relationships. Other nutrients, principally phosphorus and potassium,
were applied to ensure that yield was not limited. Results of the first
year of the trial are depicted in the figure below. The maximum yield
was about 115 bushels per acre. This yield was obtained at N rates of
100 lbs per acre or more with a slight yield reduction at the highest N
rate (220 lbs per acre). Only a slight change was observed in the
plumpness of barley kernels and all were acceptable for malting. The
most important characteristic of the malting process is protein. High
protein levels yield poor quality malt. BARI requires protein
concentrations to be less than 13.5 percent. From the graph, N applied
in excess of 100 lbs per acre causes increased protein making the barley
unsuitable for malting. |
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ACCOMPLISHMENTS |
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Dr. Waddell’s
experience and education has revolved around managing nutrients with
innovative strategies to increase plant efficiency and yields while
minimizing losses and the associated environmental consequences. His
research spans from the small plot scale to analysis of soil, climate,
and potential yields of the entire world. He conducted a national
analysis for the U.S. Environmental Protection Agency that estimated
both the economic and environmental impacts of the new rule for animal
feeding operations. These impacts addressed the interactive effects of
tillage, crop rotation, and fertility management using numeric
simulations designed to assess soil processes and soil productivity to
obtain environmental endpoints. In a multidisciplinary,
multi-institutional endeavor, he also designed, implemented, and managed
a research study to identify the best management practices that minimize
N loss without reducing potato yield and quality; stressing the
application and fate of nitrogen by intensively measuring its movement
in and around the soil. To date, most of his work assessed methodologies
for better accounting of N mineralization, immobilization, and turnover
from fertilizer, crop residues, and organic soil amendments to enhance N
use efficiency. The increased costs of fossil fuel derived soil
amendments and degradation of many U.S. waters provides the impetus for
conducting further research to evaluate nitrogen’s fate. Understanding
the impacts and interactions of varying the cultural practices (e.g.,
tillage, crop rotation, fertilization), soil, and climate will aid
farmers’ and decision makers’ ability to maintain and enhance the
economic aspects related to agriculture while protecting the water for
generations to come. |
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SELECTED PUBLICATIONS |
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Waddell, J.T., S.C. Gupta, J.F.
Moncrief, C.J. Rosen, and D.D. Steele. 2000. Irrigation and nitrogen
management impacts on percolation and nitrate leaching under potato.
Journal of Environmental Quality. 29:251-261
- Waddell, J.T., S.C. Gupta, J.F.
Moncrief, C.J. Rosen, and D.D. Steele. 1999. Irrigation and nitrogen
management impacts on potato yield, tuber quality, and N uptake.
Agronomy Journal. 91:991-997.
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Steele, DD., J.B. Shae, J.T. Waddell,
and S.C. Gupta. 1996. Irrigation management of potatoes in the
northern Great Plains. Transactions of ASAE Paper No. 96-2138.
American Society of Agricultural Engineers, St. Joseph, Michigan.
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Waddell, J.T.,
and R.R. Weil. 1996. Water distribution under ridge till and no-till
corn. Soil Science Society of America Journal. 60:230-237.
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CONTACT INFORMATION
Biological Science Technician
Phone: 406.433.9423
Fax: 406.433.5038
E-mail: rfrance[at]sidney.ars.usda.gov |
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EDUCATION |
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B.S. |
Botany/General Sci.
Teaching |
Montana State
University, Bozeman, MT |
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EXPERIENCE |
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Work has been centered in research during
school at MSU in an immunology lab, then safflower research headed by
Jerry Bergman of EARC and on the federal level in soil research with
Ardell Halvorson, then Verlan Cochran and presently Jed Waddell. |
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USDA-ARS-NPARL
P.O. Box 463 Sidney, MT 59270 PH: 406.433.2020 FAX: 406.433.5038
For accessibility
questions or other concerns, please e-mail: webmaster[at]sidney.ars.usda.gov
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Policies &
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