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Runoff Water Quality and Quantity in Conservation Management Systems under Simulated Rainfall
Proceedings of the 2020 Mississippi Water Resources Conference
Year: 2020 Authors: Spencer D., Krutz J., Gholson D., Locke M., Henry B., Golden B.
Midsouthern USA silt loam soils are characterized by poor soil structure, which contributes to decreased rainfall capture and increased susceptibility to erosion and off-site nutrient transport. Conservation management practices such as cover crops and no-tillage may improve infiltration and decrease contaminant runoff, thus promoting the sustainability of regional waterbodies. The effects of cover crops and tillage system on runoff water quantity and quality under simulated rainfall were evaluated on a Commerce very fine sandy loam (fine-silty, mixed, superactive, nonacid, thermic Fluvaquentic Endoaquepts) at Stoneville, MS from 2017 to 2019. Neither cover crops nor no-tillage decreased runoff under simulated rainfall. In 2017 and 2018, cover crops did not have an effect on water quality. No-tillage improved turbidity, but also increased runoff water concentrations and loads of some nutrients. Water quality results from 2019 will be presented as well.