Tony J Vyn
Henry A. Wallace Chair in Crop Sciences
Professor of Agronomy​
Department​: Agronomy
Phone: 765.496.3757
Fax: 765.496.2926
  Office: Lilly Hall, Room# 3-450B

  Area of Expertise: 
Cropping Systems, Tillage​
  ​Complete List of Publications​



Top Row: Late nitrogen (N) application in Indiana’s corn production systems that are enabled by high clearance equipment, and that permit more synchrony between N fertilizer application and the timing of plant N uptake in modern corn hybrids.  Middle Row [left to right]: Strip-till planting an integrated field trial near West Lafayette, IN involving corn hybrids from different decades seeded at multiple plant densities (April 2014), Dr. Tony J. Vyn with graduate student group (May 2014). Bottom Row [left to right]: Dr. Tony J. Vyn with post-doctoral students and visiting scholars from Brazil, China, Hungary and Nigeria (March 2014), Dr. Tony J. Vyn with graduate student group (June 2018)

In the News

Jul 2019 | Study Highlights Nitrogen Efficiency Gains in Corn Hybrids Over 70 Years
Mar 2019 | Size Matters: Increasing Kernel Size in Corn - Top Crop Manager
Aug 2018 | Vyn Appointed Henry A. Wallace Chair in Crop Sciences​


Dr. Tony J. Vyn, Henry A. Wallace Chair in Crop Sciences poses with Provost Jay Akridge at the Board of Trustees Meeting on August 3, 2018.
Jul 2017 | Scientists Identify Link Between Plant Nitrogen Uptake and Reduction in Greenhouse Gas Emissions

New Extension Publications
May 2018 | McClellan Maaz, T., R. A. Omonode, and T.J. Vyn. 2018. Can lower nitrogen balances and greater recovery by corn reduce N2O emissions? Better Crops 102 (2): 27-30.$FILE/BC-2018-2%20p27.pdf
Aug 2017 | August, 2017. Mueller, S.M. and T.J. Vyn. 2017. The effects of late-season nitrogen applications in corn. Purdue Extension AY-364-W​

Featured Videos
Dec 2020| Hybrid Differences in Nutrient Uptake | 2020 Indiana CCA Conference
Nov 2019 | Relative Tillage and Rotation System Performance in Corn and Soybean with Progressively Later Planting Dates | ASA, CSSA and SSSA International Annual Meetings (2019), San Antonio, TX
Jan 2018 | Keys to Big Corn: A Lifelong Learning Process | Corn School, Real Agriculture | Southwest Agricultural Conference | Ridgetown, Ontario, Canada
Dec 2017 | Countering Two Criticisms of Modern Corn Production: Increased Nitrogen Fertilizer Dependency and Decreased Nutritional Quality | Purdue University
Jan 2017 | Potassium Placement Strategies for Optimum Nutrient Balance in Modern Corn Hybrids | Frontiers of Potassium Science Conference | Rome, Italy
Mar 2016 | Deep Banding of P and K for More Sustainable Corn Production | Corn School, Real Agriculture | Ontario CCA Annual Conference | London, Ontario, Canada
Dec 2014 | Adjusting Nutrient Management to Modern Corn Hybrids: Achieving Balance​ | 2014 Alabama Corn Short Course | Auburn, Alabama 
Jan 2013 | Managing Potassium and Nitrogen for Corn in Dryer Soil Conditions​ | Corn School, Real Agriculture | Southwest Agricultural Conference | Ridgetown, Ontario, Canada
Jan 2013 | Managing Your Corn for Drought Tolerance​ | Corn School, Real Agriculture | Southwest Agricultural Conference | Ridgetown, Ontario, Canada 

Recent Journa​l Publications
Lifetime count: > 120 (past three years listed below)    
  • Olmedo Pico, L.B., Vyn, T.J., 2021. Dry matter gains in maize kernels are dependent on their nitrogen accumulation rates and duration during grain filling. Plants 10, 1222. 
  • Olmedo Pico, L.B., Zhang, C., Vyn, T.J., 2021. The central role of ear nitrogen uptake in maize endosperm cell and kernel weight determination during the lag period. F. Crop. Res. 273, 108285. 
  • Pasley, Heather R., James J. Camberato,  Jill E. Cairns, Mainassara Zaman-Allah, Biswanath Das, and Tony J. Vyn. 2020. Nitrogen rate impacts on tropical maize nitrogen use efficiency and soil nitrogen depletion in eastern and southern Africa. Nutrient Cycling and Agroecosystems (Feb., 2020).     Open Access
  • Jim Gaffney, James Bing, Patrick F. Byrne, Kenneth, G. Cassman, Ignacio Ciampitti, Deborah Delmer, Jeffrey Habben, H. Renee Lafitte, Ulrika E. Lidstrom, Dana O. Porter, John E. Sawyer, Jeff Schussler, Tim Stetter, Robert E. Sharp, Tony J. Vyn, David Warner. 2019. Science-based intensive agriculture: Sustainability, food security, and the role of technology. Global Food Security 23: 236-244. View the Publication
  • Mueller, S.M., C.D. Messina, and T.J. Vyn. 2019. The role of the expnential and linear phases of maize (Zea mays L.) ear growth for determination of kernel number and kernel weight. European Journal of Agronomy 111 #125939
  • H.R. Pasley, J.E. Cairns, J.J. Camberato, T.J. Vyn. 2019. Nitrogen fertilizer rate increases plant uptake and soil availability of essential nutrients in continuous maize production in Kenya and Zimbabwe. Nutr Cycl Agroecosyst Pages 1-17. doi:10.1007/s10705-019-10016-1  View the Publication
  • Mueller, S.M., C.D. Messina, and T.J. Vyn. 2019. Simultaneous gains in grain yield and nitrogen efficiency over 70 years of maize genetic improvement. Scientific Reports 9: 9095 p. 1-9. View the Publication
  • Mueller, S.M. and T.J. Vyn*. 2018. Physiological constraints to realizing maize grain yield recovery with silking-stage nitrogen fertilizer applications. Field Crops Research 228: 102-109.​
  • Mueller, S.M.*, H.R. Pasley, L. Olmedo Pico, S.D. Armstrong, R. Sripada and T.J. Vyn. 2018. Re-evaulation of soil N sampling strategy effects on statistical power. Commun. Soil Sci. & Plant Anal. Published July 9, 2018. View the Publication​
  • Mueller, S.M., and T.J. Vyn. 2018. Can late-split nitrogen application increase ear nitrogen accumulation rate during the critical period in maize? Crop Science 58:1-12. doi:10.2135/cropsci2017.0200118 Open Accces. View the Publication​​
  • Chen, Keru, and Tony J. Vyn*. 2017. Post-silking factor consequences for N efficiency changes over 38 years of commercial maize hybrids. Frontiers in Plant Science (8:1737 1-18)  View the Publication​ 
  • Li, G., B. Zhao, S., Dong, J. Zhang, P. Liu and T.J. Vyn. 2017. Impact of controlled release on urea on maize yield and nitrogen use efficiency under different water conditions. PLoS ONE 12 (7): View the Publication​
  • Mueller, S.M., J. Camberato, C. Messina, J. Shanahan, H. Zhang and T.J. Vyn*. 2017. Late-split N applications increased maize plant N recovery but not yield under moderate to high N rates. Agron. J. 109:2589-2699. doi: 10.2134/agronj2017.05.0282 View the Publication​​
  • ​​De Oliveira Silva, A., J.J. Camberato, T. Coram, T. Filley, and T.J. Vyn*. 2017. Applicability of ​a "multi-stage pulse labeling" 15N approach to phenotype N dynamics in maize plant components during the growing season. Front. Plant Sci. 8: 1-17. doi: 10.3389/fpls.2017.01360  View the Publication​
  • *Kovacs,P., and T.J. Vyn*. 2017. Relationships between ear-leaf nutrient concentrations and silking and corn biomass and grain yields at maturity. Agron. J. 109: 2898-2906. doi: 10.2134/agronj2017.02.0119   View the Publication​ 
  • Omonode.R.A., A.D. Halvorson, B. Gagnon, and T.J. Vyn*. 2017. Achieving lower nitrogen balance and higher nitrogen recovery efficiency reduces nitrous oxide emissions in North America's maize cropping systems. Frontiers in Plant Science 8:1080. doi: 10.3389/fpls.2017.01080 View the Publication 
  • Chen.K.*, J.J. Camberato, and T.J. Vyn*. 2017. Maize grain yield and kernel component relationships to morphophysiological hybrids separated by four decades. Crop Science 57 (3): 1-17.DOI: 10.3235/cropsci2016.06.0540 View the Publication​
  • ​Chen, K.* J.J. Camberato, M.R. Tuinstra, S.V. Kumudini, M. Tollenaar, and T.J. Vyn*. 2016. Genetic improvement in density and nitrogen stress tolerance traits over 38 years of commercial maize hybrid release. Field Crops Res. 196 438-451. doi: 10.1016/j.fer2016 07.025.  View the Publication
  • ​​Mueller, S.M.* and T.J. Vyn* .2016. Maize plant resilience to N stress and post-silking N capacity changes over time: A review. Frontiers in Plant Science 7:53 1-14     View the Publication​
  • Chen,K., Kumudini, S.V., Tollenar, M., and Vyn, T.J*, 2015. Plant biomass and nitrogen partitioning changes between silking and maturity in newer versus older maize hybrids. Field Crops Research. 183:315-328. View the Publication​​
  • Kovacs, P.*, G.E. Van Scoyoc, T.A. Doerge, J.J. Camberato, and T.J. Vyn*. 2015. Anhydrous Ammonia Timing and Rate Effects on Maize N Use Efficiencies. Agronomy Journal 107: 1205-1214. doi:10.2134/agronj14.0350 View the Publication
  • Omonode, R.A*, Kovacs, P., & Vyn, T.J.* 2015. Tillage and nitrogen rate effects on area-and yield-scaled nitrous oxide emissions from pre-plant anhydrous ammonia. Agronomy Journal 107:605-614, doi: 10.2134/agronj14.0440 View the Publication​​
 ​Non-refereed Conference Proceedings
  •  Kovacs, P., G.E. Van Scoyoc, T.A. Doerge, J.J. Camberato, and T.J. Vyn. 2012. Consequences of shallow NH3 placement and timing on N use efficiencies in corn production. Proceedings, 42nd North Central Extension-Industry Soil Fertility Conference, Des Moines, Iowa. November 14-15, 2012. Pages 183-189. View the Publication​ ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

Department of Agronomy, 915 West State Street, West Lafayette, IN 47907-2053 USA, (765) 494-4773

© Purdue University | An equal access/equal opportunity university | Integrity Statement | Copyright Complaints | Maintained by Agricultural Communication

Trouble with this page? Disability-related accessibility issue? Please contact us at so we can help.

Sign In