Bromide and nitrate movement through undisturbed soil columns

Field experiments often assume that Br(-), 14NO3(-)-N, and 15NO3(-)-N have similar leaching kinetics. This study tested this assumption. Twenty-four undisturbed soil columns (15-cm diameter) were collected from summit-shoulder, backslope, and footslope positions of a no-tillage field with a corn (Ze...

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Bibliographic Details
Published in:Journal of environmental quality 2004-01, Vol.33 (1), p.338-342
Main Authors: Clay, D.E, Zheng, Z, Liu, Z, Clay, S.A, Trooien, T.P
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Applied sciences
Biological and medical sciences
Biological and physicochemical properties of pollutants. Interaction in the soil
bromides
Bromides - chemistry
Chromatography, Liquid
corn
crop rotation
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Glycine max
Humans
isotope labeling
Kinetics
landscape position
Leaching
nitrate nitrogen
Nitrates
Nitrates - chemistry
no-tillage
Pollution
Pollution, environment geology
slope
Soil
Soil and sediments pollution
Soil and water pollution
Soil contamination
Soil Pollutants
Soil science
soil transport processes
Soils
sorption
soybeans
Zea mays
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Summary:Field experiments often assume that Br(-), 14NO3(-)-N, and 15NO3(-)-N have similar leaching kinetics. This study tested this assumption. Twenty-four undisturbed soil columns (15-cm diameter) were collected from summit-shoulder, backslope, and footslope positions of a no-tillage field with a corn (Zea mays L.)-soybean [Glycine max (L.) Merr.] rotation. Each of the landscape positions had a different soil series. After conditioning the columns with 4 L of 0.01 M CaCl2 (2 pore volumes), 15N-labeled Ca(NO3)2 and KBr were applied to the soil surface and leached with 4 L of 0.01 M CaCl2. Leachate was collected, weighed, and analyzed for NO3(-)-N, NH4(+)-N, 15N, 14N, and Br(-). The total amount of 15NO3(-)-N and 14NO3(-)-N collected in 1000, 2000, and 3000 mL of leachate was similar. These data suggest that 15N discrimination during leaching did not occur. Bromide leached faster through the columns than NO3(-)-N. The more rapid transport of Br(-) than NO3(-)-N was attributed to lower Br(-) (0.002 +/- 0.036 mg kg(-1)) than NO3(-)-N (0.17 +/- 0.03 mg kg(-1)) sorption. Results from this study suggest that (i) if Br(-) is used to estimate NO3(-)-N leaching loss, then NO3(-)-N leaching losses may be overestimated by 25%; (ii) the potential exists for landscape position to influence anion retention and movement in soil; and (iii) 15N discrimination was not detected during the leaching process.
ISSN:0047-2425
1537-2537
DOI:10.2134/jeq2004.3380