Nitrogen Application Rate Effects on Corn Yield and Nitrate-Nitrogen Concentration and Loss in Subsurface Drainage

2005 ◽  
Author(s):  
Peter A. Lawlor ◽  
Matthew J. Helmers ◽  
James L. Baker ◽  
Stewart W. Melvin ◽  
Dean W. Lemke
Keyword(s):  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Subsurface Drainage ◽  
Application Rate ◽  
Corn Yield ◽  
Nitrogen Application ◽  
Rate Effects ◽  
Nitrogen Application Rate

Nitrogen loss on tile-drained Mollisols as affected by nitrogen application rate under continuous corn and corn-soybean rotation systems

2012 ◽  
Vol 92 (3) ◽  
pp. 493-499 ◽  
Author(s):  
M.J. Helmers ◽  
X. Zhou ◽  
J.L. Baker ◽  
S.W. Melvin ◽  
D.W. Lemke
Keyword(s):  
Nitrogen Loss ◽  
Subsurface Drainage ◽  
Application Rate ◽  
Corn Yield ◽  
Nitrogen Application ◽  
N Application ◽  
Continuous Corn ◽  
Application Rates ◽  
N Application Rate ◽  
Nitrogen Application Rate

Helmers, M. J., Zhou, X., Baker, J. L., Melvin, S. W. and Lemke, D. W. 2012. Nitrogen loss on tile-drained Mollisols as affected by nitrogen application rate under continuous corn and corn-soybean rotation systems. Can. J. Soil Sci. 92: 493–499. Nitrate-nitrogen (NO3-N) loss from production agricultural systems through subsurface drainage networks is of local and regional concern throughout the Midwestern United States. The increased corn acreage and the practice of growing continuous corn instead of a corn-soybean rotation system due to the increasing demand for food and energy have raised questions about the environmental impacts of this shift in cropping systems. The objective of this 4-yr (1990–1993) study was to evaluate the effect of nitrogen (N) application rate (0–168 kg N ha−1 for corn following soybean and 0–224 kg N ha−1 for corn following corn) on NO3-N concentration, NO3-N losses, and crop yields in continuous corn and corn-soybean production systems on tile-drained Mollisols in north central Iowa. The results show that NO3-N concentrations from the continuous corn system were similar to NO3-N concentrations from the corn-soybean rotation at equivalent N application rates.When extra N fertilizer (approximately 56 kg N ha−1) was applied to continuous corn than the corn-soybean rotation, this resulted in 14–36% greater NO3-N concentrations in subsurface drainage from the continuous corn system. While corn yield increased as N application rate increased, corn yields at the recommended N application rates (112–168 kg N ha−1) in the corn-soybean rotation were up to 3145 kg ha−1 greater than corn yields at the recommended application rates (168–224 kg N ha−1) in the continuous corn system. The corn-soybean rotation with recommended N application rates (168–224 kg N ha−1) appeared to be beneficial environmentally and economically.

First Harvest Timing and Nitrogen Application Rate Effects on Chemical Composition and Ethanol Yield of Switchgrass

cftm ◽  
2016 ◽  
Vol 2 (1) ◽  
pp. 1-16
Author(s):  
Ramdeo Seepaul ◽  
Bisoondat Macoon ◽  
K. Raja Reddy ◽  
William B. Evans
Keyword(s):  
Chemical Composition ◽  
Ethanol Yield ◽  
Application Rate ◽  
Nitrogen Application ◽  
Rate Effects ◽  
Harvest Timing ◽  
Nitrogen Application Rate
Sign in / Sign up

Export Citation Format

Share Document