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Chad A. Toussant and Brittany R. Hanrahan examine whether two agricultural conservation practices changed the sediment and nutrients leaving a farm field near Findlay, Ohio. Their study follows surface runoff and subsurface tile drainage in the Eagle Creek watershed from 2012 through 2020, including periods when cover crops and variable rate nutrient applications were used together.
The report separates smaller runoff events from unusually large events to explore how storm intensity affects the results. It compares discharge, suspended sediment and several forms of phosphorus, using collected water samples rather than substituting estimated concentrations in the statistical assessment.
The distinction between surface and subsurface pathways is central to the findings. Improvements during smaller surface runoff events did not extend uniformly to tile drainage or larger events. Tables, site information and statistical comparisons make this a detailed case study of conservation practice evaluation within a Great Lakes priority watershed.