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

Aug 2018 | Vyn Appointed Henry A. Wallace Chair in Crop Sciences​

Jul 2017 | Scientists Identify Link Between Plant Nitrogen Uptake and Reduction in Greenhouse Gas Emissions  

 ​Lifetime count: > 110 (past three years listed below)   

• 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. doi.org/10.1038/s41598-019-45485-5
• Omonode, R.A. and T.J. Vyn. 2019. Tillage and nitrogen source impacts on relationships between nitrous oxide emission and nitrogen recovery efficiency in corn. J.OEQ doi:10.2134/jeq2018.05.0188 Open Access  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. https://doi.org/10.1016/j.fcr.2018.08.025​ Open Access
  
• 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): doi.org/10.1371/journal.pone.0181774 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​ ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​