Soil nutrient variability and groundwater nitrate-N in agricultural fields

Landscape may result in uneven nutrient loads within a field. The objective of this study was to determine the influence of landscape on soil carbon and nutrient levels, and on levels of nitrate-N in groundwater. Soil samples were collected in three fields, two transects each, 30 sites in each field...

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Bibliographic Details
Published in:The Science of the total environment 2018-06, Vol.627, p.39-45
Main Authors: Logsdon, Sally D., Cole, Kevin J.
Format: Article
Language:English
Subjects:
agricultural land
groundwater
Groundwater nitrate
Landscape
landscapes
nitrate nitrogen
nutrient content
nutrients
pollution load
soil morphology
soil nutrients
soil organic carbon
Soil phosphorus
soil sampling
wells
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Summary:Landscape may result in uneven nutrient loads within a field. The objective of this study was to determine the influence of landscape on soil carbon and nutrient levels, and on levels of nitrate-N in groundwater. Soil samples were collected in three fields, two transects each, 30 sites in each field. The soil morphology was characterized for the profile, and soil organic carbon and nutrient levels were determined for 0–0.15 and 0.15–0.3 m depths. Each field had wells installed at three of the sites. One field showed a wide range of landscape variability, and significant effects of curvature on soil carbon and nutrient levels. Another field showed no significant effect of slope or curvature on soil carbon and nutrient levels because the nutrient levels were quite variable, including high spikes. The third field had less variable landscape trends but still showed a few significant effects on soil carbon and nutrient levels. Nitrate-N levels remained high in two of the nine wells (20 to 50 mg L−1), suggesting that additions of nitrate-N at the concave or converging sites replaced any losses. Median nitrate-N levels at the other seven well sites were lower, ranging from 8 to 17 mg L−1. Influence of landscape on soil carbon and nutrients was more detectable when the landscape factors were highly variable without excessive variability in soil nutrient properties. [Display omitted] •Significant slope or curvature effects only for large range•No significant landscape effects for large nutrient range•High groundwater nitrate-N low areas: additions balanced losses
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2018.01.182