Simulating Nitrate-Nitrogen Concentration from a Subsurface Drainage System in Response to Nitrogen Application Rates Using RZWQM2

2012 ◽  
Vol 41 (1) ◽  
pp. 289-295 ◽  
Author(s):  
Zhiming Qi ◽  
Liwang Ma ◽  
Matthew J. Helmers ◽  
Lajpat R. Ahuja ◽  
Robert W. Malone
Keyword(s):  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Drainage System ◽  
Subsurface Drainage ◽  
Nitrogen Application ◽  
Application Rates

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.

scholarly journals The response of potato tuber yield, nitrogen uptake, soil nitrate nitrogen to different nitrogen rates in red soil

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kailou Liu ◽  
Jiangxue Du ◽  
Yijun Zhong ◽  
Zhe Shen ◽  
Xichu Yu
Keyword(s):  
Nitrogen Uptake ◽  
Nitrogen Fertilizer ◽  
Nitrogen Balance ◽  
Nitrogen Fertilization ◽  
Tuber Yield ◽  
Nitrate Nitrogen ◽  
Red Soil ◽  
Nitrogen Application ◽  
Nitrogen Surplus ◽  
Application Rates

AbstractNutrient-deficient red soil found in the southern region of China is increasingly being used for potato crops to meet the demand for this staple food. The application of nitrogen fertilizer is necessary to support the production of higher tuber yields; however, the links between nitrate nitrogen and the nitrogen balance in red soil are unknown. A field experiment was conducted in Jiangxi Province in 2017 and 2018 to determine the effects of different nitrogen application rates, 0 kg ha−1 (N0), 60 kg ha−1 (N60), 120 kg ha−1 (N120), 150 kg ha−1 (N150), 180 kg ha−1 (N180), 210 kg ha−1 (N210), and 240 kg ha−1 (N240, the highest rate used by local farmers), on potatoes growing in red soil. Data on tuber yield, crop nitrogen uptake, and the apparent nitrogen balance from the different treatments were collected when potatoes were harvested. Additionally, the content and stock of nitrate nitrogen at different soil depths were also measured. Nitrogen fertilization increased tuber yield but not significantly at application rates higher than 150 kg ha−1. We estimated that the threshold rates of nitrogen fertilizer application were 191 kg ha−1 in 2017 and 227 kg ha−1 in 2018, where the respective tuber yields were 19.7 and 20.4 t ha−1. Nitrogen uptake in potato in all nitrogen fertilization treatments was greater than that in N0 by 61.2–237% and 76.4–284% in 2017 and 2018, respectively. The apparent nitrogen surplus (the amount of nitrogen remaining from any nitrogen input minus nitrogen uptake) increased with increasing nitrogen application rates. The nitrate nitrogen stock at a soil depth of 0–60 cm was higher in the 210 and 240 kg ha−1 nitrogen rate treatments than in the other treatments. Moreover, double linear equations indicated that greater levels of nitrogen surplus increased the nitrate nitrogen content and stock in soils at 0–60 cm depths. Therefore, we estimate that the highest tuber yields of potato can be attained when 191–227 kg ha−1 nitrogen fertilizer is applied to red soil. Thus, the risk of nitrate nitrogen leaching from red soil increases exponentially when the apparent nitrogen balance rises above 94.3–100 kg ha−1.

Comparing Simulated Nitrate-Nitrogen Concentration In Subsurface Drainage Using Drainmod-N II and RZWQM2

2017 ◽  
Vol 66 (2) ◽  
pp. 238-251 ◽  
Author(s):  
Xuan Du ◽  
Hao Feng ◽  
Matthew J. Helmers ◽  
Zhiming Qi
Keyword(s):  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Subsurface Drainage
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