Phosphorus losses from monitored fields with conservation practices in the Lake Erie Basin,USA |
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Authors: | Douglas R Smith Wendy Francesconi Stan J Livingston Chi-hua Huang |
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Institution: | 1.USDA-ARS,Grassland, Soil and Water Research Laboratory,Temple,USA;2.USDA-ARS,National Soil Erosion Research Laboratory,West Lafayette,USA |
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Abstract: | Conservation practices are implemented on farm fields in the USA through Farm Bill programs; however, there is a need for greater verification that these practices provide environmental benefits (e.g., water quality). This study was conducted to assess the impact of Farm Bill eligible conservation practices on soluble P (SP) and total P (TP) losses from four fields that were monitored between 2004 and 2013. No-tillage doubled SP loading compared to rotational tillage (e.g., tilled only before planting corn); however, no-tillage decreased TP loading by 69 % compared to rotational tillage. Similarly, grassed waterways were shown to increase SP loads, but not TP loads. A corn–soybean–wheat–oat rotation reduced SP loads by 85 % and TP loads by 83 % compared to the standard corn–soybean rotation in the region. We can potentially attain TP water quality goals using these Farm Bill practices; however, additional strategies must be employed to meet these goals for SP. |
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