**6.2 Methodology**

Five surface soil samples were obtained in the riparian buffer and five surface soil samples were obtained from the production field, but adjacent to the riparian buffer. All sampled surface samples were from the Wilbur soil series. Measured soil properties included: (i) pH in water, (ii) soil organic matter by loss on ignition, (iii) sulfate by 2 M KCl extraction, (iv) ammonium and nitrate extraction, and (v) phosphorus by the Bray-1 extraction. These laboratory tests were performed by the University Missouri Soil Test Laboratory using routine protocols. The soil profile morphology was performed by USDA with subsequent analysis in the USDA soil characterization laboratory.
