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Abstract
Surface and ground‐water quality were monitored in the Appoquinimink Watershed as part of the Appoquinimink Rural Clean Water Project (RCW)). Surface water was monitored for seven years and ground water was monitored for three years. As part of the RCWP plan, conservation tillage, fertilizer management and pesticide management were the most widely used best management practices.
Best management practices decreased total phosphorus and total suspended solids concentrations in surface water. The unfiltered ortho phosphorus as a percentage of total phosphorus increased. Nitrogen concentrations did not change over the seven year monitoring period. The BOD concentrations increased because of increased residues left on the surface from conservation tillage.
Atrazine was detected in the shallow ground water at concentrations ranging from 1 to 45 μg/L. Aldicarb was only detected in one monitoring well. Nitrate concentrations were above 10 mg/L in some areas of the watershed.
Notes
Published as Miscellaneous Paper No. 1272 of the Delaware Agricultural Experiment Station.