Directory

Trenton Roberts

Trenton Roberts

Research Assistant Professor of Soil Fertility/Soil Testing

Director Experiment Station

(CSES)-Crop, Soil and Environmental Sciences

Phone: 479-575-6752

Fax: (479) 575-3975

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Research Emphasis

Investigation of soil-based nitrogen tests for fertilizer management in crop production, with specialization in rice, wheat, and corn. Development of analytical methods for soil and plant analysis, including fractionation of soil organic nitrogen with an emphasis on identifying potentially mineralizable nitrogen.

Modeling crop response to nitrogen fertilizer application to determine economic optimum nitrogen rates for crop production.

Development of better management strategies for crop production through the investigation of the nitrogen balance (i.e., nitrogen utilization, nitrogen transformations, nitrogen losses and mechanisms, and nitrogen mineralization from soil and plant residues).

Use of stable isotopes as tracers in terrestrial systems.

Program Area

  • Soil Fertility and Plant Nutrition
  • Development of New Soil Test Methods

Courses Taught

ENSC 3263- Environmental Soil and Water Conservation (Fall). This course is designed to focus on the importance of soil and water as a vital natural resource. Erosion and erosion control practices are discussed for agricultural, urban and natural ecosystems. Time will be devoted to understanding soil erosion processes, water conservation and the metrics necessary to calculate the risk benefit of agricultural production practices on natural resources conservation and long-term agricultural sustainability.

CSES 4013- Advanced Crop Science (Co-Taught, Fall). This course is designed to prepare undergraduate and graduate students for the Certified Crop Advisor Exam. I am responsible for covering soil fertility and nutrient management. My section objectives cover basics of plant nutrition, soil fertility, tissue analysis, fertilizer recommendations and nutrient management planning.

Education

  • Ph.D., University of Arkansas, 2010, Soil Fertility and Plant Nutrition 
    • Dissertation Title: Soil-based Tests for Nitrogen Fertilizer Recommendations in Arkansas Rice Production
  • M.S., University of Arizona, 2006, Soil and Water Science
    • Thesis Title: Salt Accumulation with Sub-surface Drip Irrigation
  • B.S., Oklahoma State University, 2003, Plant and Soil Sciences

Publications

Roberts, T.L., R.J. Norman, N.A. Slaton and A.M. Fulford. 2013. Field validation of N-STaR: Site-specific N technology for rice produced on silt loam soils in Arkansas. Soil Sci. Soc. Am. J. 77:539-545.

 

Roberts, T.L., R.J. Norman, N.A. Slaton and A.M. Fulford. 2013. Assimilation of 15N Labeled Injected at Various Depths by Delayed-flood Rice. Soil Sci. Soc. Am. J. 77:2039-2044.

Norman, R.J., T.L. Roberts, N.A. Slaton, and A.M. Fulford. 2013. Nitrogen Uptake Efficiency of a Hybrid Compared with a Conventional, Pure-Line Rice Cultivar. Soil Sci. Soc. Am. J. 77:1235-1240.

Stiegler, J.C., M.D. Richardson, D.E. Karcher, T.L. Roberts and R.J. Norman. 2013. Foliar Absorption of Various Inorganic and Organic Nitrogen Sources by Creeping Bentgrass. Crop Science 53: 3: 1148-1152.

Slaton, N.A., T.L. Roberts, B.R. Golden, W.J. Ross and R.J. Norman. 2013. Soybean Response to Phosphorus and Potassium Supplied as Inorganic Fertilizer or Poultry Litter. Agronomy Journal 105: 3: 812-820.

Rogers, C.W., K.R. Brye, R.J. Norman, E.E. Gbur, J.D. Mattice, T.B. Parkin and T.L. Roberts. 2013. Methane Emissions from Drill-Seeded, Delayed-Flood Rice Production on a Silt-Loam Soil in Arkansas. Journal of Environmental Quality 42: 4: 1059-1069.

Roberts, T.L., W.J. Ross, J.C. Stiegler, R.J. Norman, N.A. Slaton and C.E. Wilson Jr. 2012. Factors influencing the recovery of glucosamine nitrogen from soils commonly cropped to rice. Soil Sci. Soc. Am. J. 76:252-257.

Roberts, T.L., R.J. Norman, W.J. Ross, N.A. Slaton and C.E. Wilson Jr. 2012. Soil depth coupled with soil nitrogen and carbon can improve fertilization of rice in Arkansas. Soil Sci. Soc. Am. J. 76:268-277.

Roberts, T.L., W.J. Ross, R.J. Norman, N.A. Slaton and C.E. Wilson Jr. 2011. Predicting nitrogen fertilizer needs for rice in Arkansas using alkaline hydrolyzable-N. Soil Sci. Soc. Am. J. 75:1161-1171.

Stiegler, J.C., M.D. Richardson, D.E. Karcher, T.L. Roberts, and R.J. Norman. Field-based measurement of ammonia volatilization following foliar applications of urea to putting green turf. Crop Sci. 51:1767-1773.

Watkins, K.B., J.A. Hignight, R.J. Norman, T.L. Roberts, N.A. Slaton, C.E. Wilson Jr., and D.L. Frizzell. 2010. Comparison of Economic Optimum Nitrogen Rates for Rice in Arkansas. Agron. J. 102:1099-1108.

Roberts, T.L., R.J. Norman, N.A. Slaton, and C.E. Wilson Jr. 2009. Changes in alkaline hydrolyzable nitrogen distribution with soil depth: Implications for fertilizer correlation and calibration. Soil Sci. Soc. Am. J. 73:2143-2150.

Roberts, T.L., R.J. Norman, N.A. Slaton, C.E. Wilson Jr. W.J. Ross, and J.T. Bushong. 2009.
Direct steam distillation as an alternative to the Illinois Soil Nitrogen Test. Soil Sci. Soc. Am. J. 73:1268-1275.

Roberts, T.L., N. Lazarovitch, A.W. Warrick, and T.L. Thompson. 2009. Modeling salt accumulation with subsurface drip irrigation using HYDRUS-2D. Soil Sci. Soc. Am. J. 73:233-240.

Roberts, T.L., S.A. White, A.W. Warrick, and T.L. Thompson. 2008. Tape depth and germination method influence patterns of salt accumulation with subsurface drip irrigation. Agric. Water Manage. 95:669-677.

Bushong, J.T., T.L. Roberts, W.J. Ross, R.J. Norman, N.A. Slaton, and C.E. Wilson Jr. 2008. Evaluation of distillation and diffusion techniques for estimating hydrolyzable amino sugar-nitrogen as a means of predicting N mineralization. Soil Sci. Soc. Am. J. 72:992-999.

Roberts, T.L., and J.A. Hattey. 2004. Combining diesel-contaminated soil and anhydrous ammonia-contaminated soil to measure the effectiveness of total petroleum hydrocarbon remediation. J. Nat. Resour. Life Sci. Educ. 33:47-50.

Presentations

Roberts, T.L., R.J. Norman, N.A. Slaton, C.E. Wilson Jr., and A.M. Fulford. 2010. Field Validation of N-ST*R: A Precision Nitrogen Management Tool for Direct-Seeded Delayed-Flood Rice. In Rice Technical Working Group Abstracts. [CD-ROM]. 33rd Meeting, Biloxi, MS.

Norman, R.J., A.J. Enochs, T.L. Roberts, N.A. Slaton, C.E. Wilson Jr., D.L. Frizzell, and J.D. Branson. 2010. Nitrogen Content in Floodwater of Drill-Seeded, Delayed-Flood Rice Following Urea Fertilization. In Rice Technical Working Group Abstracts. [CD-ROM]. 33rd Meeting, Biloxi, MS.

Roberts, T.L., R.J. Norman, N.A. Slaton, and C.E. Wilson Jr. 2009. Changes in alkaline hydrolyzable nitrogen distribution with soil depth: Implications for fertilizer correlation and calibration. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Stiegler, J.C., M. Richardson, R.J. Norman and T.L. Roberts. 2009. Indirect Measurement of Ammonia Volatilization Following Foliar Application of Urea to Putting Green Turf. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Slaton, N.A., R.J. Norman, R. Delong, B.R. Golden, T.L. Roberts and J. Kelley. 2009. Changes in alkaline hydrolyzable nitrogen distribution with soil depth: Implications for fertilizer correlation and calibration. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Roberts, T.L., R.J. Norman, N.A. Slaton, W.J. Ross, C.E. Wilson Jr., and M.S. Reiter. 2008. Nitrogen Recommendations for Rice in Arkansas Using the Illinois Soil Nitrogen Test and Direct Steam Distillation. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Enochs, A.J., T.L. Roberts, T.W. Walker, R.J. Norman, and C.E. Wilson Jr. 2008. Effect of Nutrisphere on Ammonia Volatilization Loss of Urea and the Grain Yield of Drill-Seeded, Delayed Flood Rice. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Enochs, A.J., T.L. Roberts, N.A. Slaton, R.J. Norman, C.E. Wilson Jr., D.L. Frizzell, and J.D. Branson. 2008. Nitrogen Content in Floodwater of Drill-Seeded, Delayed Flood Rice Following Urea Fertilization. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Stiegler, J.C., M. Richardson, D. Karcher, R.J. Norman and T.L. Roberts. 2008. Direct Measurement of Foliar-Applied Nitrogen Uptake by a Cool-Season and Warm-Season Putting Green Turfgrass Species. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Roberts, T.L., R.J. Norman, N.A. Slaton, C.E. Wilson Jr., W.J. Ross and J.T. Bushong. 2008. Soil-Based Nitrogen Tests for Fertilizer Recommendations in Arkansas Rice Production. In Rice Technical Working Group Abstracts. [CD-ROM]. 32nd Meeting, San Diego, CA.

Roberts, T.L., R.J. Norman, T.W. Walker, D.L. Harrell and G.N. McCauley. 2008. Regional Assessment of Soil-Based Nitrogen Tests for Rice Production in the Mid-South USA. In Rice Technical Working Group Abstracts. [CD-ROM]. 32nd Meeting, San Diego, CA.

R.J. Norman, C.E. Wilson Jr., T.L. Roberts, T.W. Walker, D.L. Frizzell, A.J. Enochs, J.D. Branson, and N.A. Slaton. 2008. Evaluation of Agrotain and Nutrisphere coated urea applied preflood to delayed-flood rice. In Rice Technical Working Group Abstracts. [CD-ROM]. 32nd Meeting, San Diego, CA.

Roberts, T.L., W.J. Ross, R.J. Norman, N.A. Slaton, and C.E. Wilson Jr. 2007. Direct steam distillation or ISNT diffusion? Assessment of the two methods in recovering selected organic N compounds. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Roberts, T.L., W.J. Ross, R.J. Norman, C.E. Wilson Jr., N.A. Slaton, and J.T. Bushong. 2007. Soil-Based nitrogen tests for rice production: Taking it to another depth. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Stiegler, J.C., M. Richardson, D. Karcher, R.J. Norman and T.L. Roberts. 2007. Field evaluation of foliar nutrient uptake by a cool-season and warm-season putting green turfgrass species. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Slaton, N.A., T.L. Roberts, R.J. Norman, R.E. DeLong, and C.V. Tucker. 2006. Inorganic nitrogen concentrations in rice floodwater. In Proceedings: Lower Mississippi Symposium-Nutrient Loading and removal in the Lower Mississippi River Basin: Data, Trends and Opportunities. Lower Mississippi River Sub-basin Committee on Hypoxia. June 1-2, 2006. New Orleans, LA.

Roberts, T.L., S.A. White and T.L. Thompson. 2005. Salt accumulation with subsurface drip irrigation. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Roberts, T.L., N. Lazarovitch, A.W. Warrick and T.L. Thompson. 2005. Modeling salt accumulation from subsurface drip irrigation. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Roberts, T.L., and J.A. Hattey. 2003. Utilizing anhydrous ammonia-contaminated soil as a nitrogen source to measure the effectiveness of total petroleum hydrocarbon remediation. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Roberts, T.L., and J.A. Hattey. 2002. Measurement of beef, poultry and swine manure composition by near-infrared spectroscopy. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Roberts, T.L., J.A. Hattey and H. Zhang. 2001. Analyzing animal manure using near infrared spectroscopy. In Annual Meetings Abstracts [CD-ROM]. ASA, CSSA, and SSSA, Madison, WI.

Extension Publications

T.L. Roberts, R.J. Norman, N.A. Slaton, C.E. Wilson Jr., and W.J. Ross. 2010. N-ST*R- A Soil-Based Nitrogen Test for Fertilizer Recommendations in Arkansas Rice Production. In R.J. Norman, J.F. Meullenet and K.A.K. Moldenhauer (ed.) B.R. Wells Rice Research Studies-2009. University of Arkansas Agricultural Experiment Station Research Series 571:157-167. Fayetteville, Ark.

T.L. Roberts, R.J. Norman, N.A. Slaton, and C.E. Wilson Jr. 2010. Alkaline Hydrolyzable Nitrogen Changes with Soil Depth: Implications for Calibration of Predicted Nitrogen Rates. In R.J. Norman, J.F. Meullenet and K.A.K. Moldenhauer (ed.) B.R. Wells Rice Research Studies-2009. University of Arkansas Agricultural Experiment Station Research Series 571:168-185. Fayetteville, Ark.

Roth, C.R., T.L. Roberts, and R.J. Norman. 2009. Variable rates of Agrotain on ammonia volatilization loss of urea applied to a Dewitt silt loam. In R.J. Norman, J.F. Meullenet and K.A.K. Moldenhauer (ed.) B.R. Wells Rice Research Studies-2008. University of Arkansas Agricultural Experiment Station Research Series 571:240-245. Fayetteville, Ark.

Norman, R.J., C.E. Wilson, Jr., N.A. Slaton, D.L. Frizzell, J.D. Branson, M.W. Duren, T.L. Roberts, K.A.K. Moldenhauer, and J.W. Gibbons. 2009. Grain yield response of thirteen new rice cultivars to nitrogen fertilization. In R.J. Norman, J.F. Meullenet and K.A.K. Moldenhauer (ed.) B.R. Wells Rice Research Studies-2008. University of Arkansas Agricultural Experiment Station Research Series 571:224-239. Fayetteville, Ark.

Enochs, A.J., T.L. Roberts, N.A. Slaton, R.J. Norman, C.E. Wilson Jr., D.L. Frizzell, and J.D. Branson. 2009. Nitrogen Content in Floodwater of Drill-Seeded, Delayed Flood Rice Following Urea Fertilization. In R.J. Norman, J.F. Meullenet and K.A.K. Moldenhauer (ed.) B.R. Wells Rice Research Studies-2008. University of Arkansas Agricultural Experiment Station Research Series 571:200-206. Fayetteville, Ark.

Stiegler, J.C., M.D. Richardson, J.H. McCalla, J.W. Landreth and T.L. Roberts. 2009. Nitrogen rate and season influence ammonia volatilization following foliar application of urea to putting green turf. Arkansas Turfgrass Report 2008, University of Arkansas Agricultural Experiment Station Research Series 568:112-117. Fayetteville, Ark.

T.L. Roberts, R.J. Norman, N.A. Slaton, C.E. Wilson Jr., and W.J. Ross. 2008. Evaluation of Two Soil-Based Nitrogen Tests to Enhance Fertilizer Recommendations in Arkansas Rice Production. In R.J. Norman, J.F. Meullenet and K.A.K. Moldenhauer (ed.) B.R. Wells Rice Research Studies-2007. University of Arkansas Agricultural Experiment Station Research Series 550:157-167. Fayetteville, Ark.

R.J. Norman, T.L. Roberts, T.W. Walker, C.E. Wilson Jr., A.J. Enochs, D.L. Frizzell, and J.D. Branson. 2008. Effect of Nutrisphere on Ammonia-Volatilization Loss of Urea and the Grain Yield of Drill-Seeded, Delayed-Flood Rice. In R.J. Norman, J.F. Meullenet and K.A.K. Moldenhauer (ed.) B.R. Wells Rice Research Studies-2007. University of Arkansas Agricultural Experiment Station Research Series 550:157-167. Fayetteville, Ark.

Enochs, A.J., T.L. Roberts, N.A. Slaton, R.J. Norman, C.E. Wilson Jr., D.L. Frizzell, and J.D. Branson. 2008. Nitrogen Content in Floodwater of Drill-Seeded, Delayed Flood Rice Following Urea Fertilization. In R.J. Norman, J.F. Meullenet and K.A.K. Moldenhauer (ed.) B.R. Wells Rice Research Studies-2007. University of Arkansas Agricultural Experiment Station Research Series 550:157-167. Fayetteville, Ark.

Stiegler, J.C., M.D. Richardson, J.H. McCalla, J.W. Landreth and T.L. Roberts. 2008. Indirect measurement of ammonia volatilization following foliar application of urea on a cool- and warm-season putting green turfgrass species. Arkansas Turfgrass Report 2007, University of Arkansas Agricultural Experiment Station Research Series 557:80-84. Fayetteville, Ark.

Slaton, N.A., R.E. DeLong, B.R. Golden, C.G. Massey, and T.L. Roberts. 2007. Bermudagrass forage response to nitrogen, phosphoropus, and potassium rate. In N.A. Slaton (ed.) Wayne E. Sabbe Arkansas Soil Fertility Studies-2006. University of Arkansas Agricultural Experiment Station Research Series 548:52-57. Fayetteville, Ark.

Professional Background

  • 2012-Present, Assistant Professor, Crop, Soil & Environmental Sciences, University of Arkansas, Fayetteville, AR
  • 2010-2012, Research Assistant Professor, Crop, Soil & Environmental Sciences, University of Arkansas, Fayetteville, AR

Activities

Other Information

2013    Invited Speaker at the Industry alliance Meeting, Fayetteville, AR

2012    Invited Speaker at the Mid-Atlantic Crop Management Conference,
            Ocean City, MD

2012    Invited Speaker at the Rice Technical Working Group meeting.
            Hot Springs, AR

2010    Invited Speaker-University of Arkansas Rice In-Service Training Workshop, 
            Stuttgart, AR

2010    Invited Speaker-Certified Crop Advisor Training, 33rd Annual Rice Technical
            Working Group, Biloxi, MS

2010     Arkansas Crop Management Conference, Little Rock, AR

2010     N-ST*R Validation Field Tour, Hoxie, AR

2009     Invited Speaker-Pinetree Research Center Field Day, Colt, AR

2009     N-ST*R Validation Field Tour, Newport, AR

2009     Rice Research and Extension Center Field Day, Stuttgart, AR

2008     Rice Research and Extension Center Field Day, Stuttgart, AR

2007     Assisted with rice consultant training workshop, Lonoke, AR

2007     Rice Research and Extension Center Field Day, Stuttgart, AR

2006     Lake Hogue Research Farm Field Day, Lake Hogue, AR

2006     Rice Research and Extension Center Field Day, Stuttgart, AR

Honors and Awards

2012    Distinguished Rice Research and Education Team Award, Rice Technical
            Working Group

2009    Citation for Excellence in Manuscript Review, Soil Science Society 
           of America Journal, Madison, WI. 
           Spooner Award, CSES, University of Arkansas, Fayetteville, AR. 
           Sigma Xi Scientific Research Society

2008    International Plant Nutrition Institute (IPNI) Scholar Award. 
           First Place Oral Presentation- Division S-4, S-8 Graduate Poster Competition 
           International Annual Meetings, ASA, CSSA, SSSA.

2006    Doctoral Academy Fellow, University of Arkansas.

2005    Outstanding Teaching Assistant, College of Agriculture and Life Sciences, 
           University of Arizona, Tucson, AZ.

2005    Outstanding Teaching Assistant, Department of Soil, Water and 
           Environmental Science, University of Arizona, Tucson, AZ.

2004    Outstanding Teaching Assistant, Department of Soil, Water and
           Environmental Science, University of Arizona, Tucson, AZ.