|CLARK, J. - University Of Minnesota|
|FERNANDEZ, F. - University Of Minnesota|
|CAMBERATO, J. - Purdue University|
|CARTER, P. - Dupont Pioneer Hi-Bred|
|FERGUSON, R. - University Of Nebraska|
|FRANZEN, D. - North Dakota State University|
|LABOSKI, C. - University Of Wisconsin|
|NAFZIGER, E. - University Of Illinois|
|SAWYER, J. - Iowa State University|
|SHANAHAN, J. - Fortigen|
Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 9/25/2017
Publication Date: 10/22/2017
Citation: Clark, J., Fernandez, F.G., Camberato, J.J., Carter, P.R., Ferguson, R.B., Franzen, D.W., Kitchen, N.R., Laboski, C.A., Nafziger, E.D., Sawyer, J.E., Shanahan, J. 2017. Why the different responses between single and split nitrogen applications?. ASA-CSSA-SSSA Annual Meeting, October 22-25, 2018, Tampa, Florida. Paper #106651.
Technical Abstract: Split- opposed to single-nitrogen applications may improve corn (Zea mays L.) production, N use efficiency, and lessen environmental impacts due to fertilization. However, there has been an inconsistent response of yield, plant nitrogen (N) uptake, and residual soil nitrates (RSN) when comparing single and split N applications to corn. We applied N fertilizer as a single or split application at an optimal and above optimal rate. This study was done across eight states in the U.S. Midwestern Cornbelt over three years at sites that varied in soil characteristics, precipitation, and temperature. This presentation will compare the effect of single and split N applications on yield, plant N uptake, and RSN. I will show how soil characteristics, temperature, and precipitation affect these responses. The findings of this study will identify the soil and weather conditions that may be responsible for the differences found in the corn yield, N use efficiency, and RSN responses to single vs. split N applications. These findings will help farmers use the soil and weather information that pertains to their field to decide whether single or split N applications will be best.