scholarly journals Transport and Fate of Nitrate in a Glacial Outwash Aquifer in Relation to Ground Water Age, Land Use Practices, and Redox Processes

2002 ◽  
Vol 31 (3) ◽  
pp. 782-796 ◽  
Author(s):  
Larry J. Puckett ◽  
Timothy K. Cowdery
Keyword(s):  
Land Use ◽  
Ground Water ◽  
Redox Processes ◽  
Water Age ◽  
Glacial Outwash ◽  
Land Use Practices

scholarly journals Factors Affecting Nitrate Concentrations in Ground Water in Stafford County, Kansas

1995 ◽  
pp. 1-9
Author(s):  
Margaret A. Townsend ◽  
David P. Young
Keyword(s):  
Land Use ◽  
Ground Water ◽  
Nitrate Contamination ◽  
High Concentration ◽  
Factors Affecting ◽  
South Central ◽  
Nitrate N ◽  
Significant Difference ◽  
Shallow Wells ◽  
Land Use Practices

Nitrate contamination of the Great Bend Prairie aquifer in south-central Kansas is more pronounced at shallower than at deeper portions of the aquifer. Factors influencing the occurrence of nitrate in the shallow ground water include irrigation-well density, subsurface clay lenses, and land-use practices. Ground-water samples were taken from 42 wells, including deep (irrigation) wells and shallow (domestic and stock) wells. Except for one well with an anomalously high concentration due to a point source, nitrate-N concentrations of sampled wells ranged from 1.3 to 13.3 mg/L with a mean of 5.4 mg/L and a median of 4.7 mg/L. Statistical analyses indicate that shallow ground water is more susceptible to contamination than deeper ground water and that lower nitrate-N concentrations are probable in wells with a greater thickness of clay above the well screen. Irrigation-well density showed a statistically significant positive correlation with nitrate-N concentrations of shallow wells. No significant difference in nitrate-N concentrations was found to result from the two irrigation methods (flood versus center-pivot) used in the area. Nor were there significant differences in nitrate-N concentrations between sandy and loamy soils. Land-use practices and subsurface stratigraphy may be better indicators of potential nitrate contamination than the surface soils.

An Excel Workbook for Identifying Redox Processes in Ground Water

2009 ◽  
Author(s):  
Bryant C. Jurgens ◽  
Peter B. McMahon ◽  
Francis H. Chapelle ◽  
Sandra M. Eberts
Keyword(s):  
Ground Water ◽  
Redox Processes

Accelerating Change

2018 ◽  
Author(s):  
Erin Stewart Mauldin
Keyword(s):  
Land Use ◽  
African Americans ◽  
Labor Relations ◽  
Cotton Production ◽  
Economic Independence ◽  
Contract Negotiations ◽  
Reduced Frequency ◽  
Ecological Event ◽  
Land Use Practices ◽  
Ecological Regime

Emancipation proved to be a far-reaching ecological event. Whereas the ecological regime of slavery had reinforced extensive land-use practices, the end of slavery weakened them. Freedpeople dedicated less time to erosion control and ditching and used contract negotiations and sharecropping arrangements to avoid working in a centrally directed gang. Understandably, freedpeople preferred to direct their own labor on an individual plot of land. The eventual proliferation of share-based or tenant contracts encouraged the physical reorganization of plantations. The combination of these two progressive alterations to labor relations tragically undermined African Americans’ efforts to achieve economic independence by tightening natural limits on cotton production and reducing blacks’ access to the South’s internal provisioning economy. The cessation, or even reduced frequency, of land maintenance on farms exacerbated erosion, flooding, and crops’ susceptibility to drought.

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