Abstract
Feeding a growing population requires striking a balance between increasing production and decreasing environmental impacts in agricultural settings. We established 12 experimental mesocosms with silt loam atop a base of sand and examined the ability of three emergent aquatic plants common to the USA to remediate pesticides and nutrients in agricultural runoff. Mesocosms were planted in monocultures of Myriophyllum aquaticum, Polygonum amphibium, and Typha latifolia, or left unvegetated to serve as controls. All mesocosms were amended with target concentrations of 10 mg L−1 (each) nitrate, ammonium, and orthophosphate; 20 μg L−1 (each) of the pesticides propanil and clomazone; and 10 μg L−1 of the pesticide cyfluthrin. After a 6-h-simulated agricultural runoff with amended water, mesocosms sat idle for 48 h before flushing with unamended water for another 6 h. Outflow water samples were collected and analyzed for contaminant concentrations. Most significant differences between vegetated mesocosms and controls occurred when comparing mean contaminant transfer/transformation rates post-amendment. Differences among plant species occurred regarding retention of dissolved nutrients orthophosphate, ammonium, and nitrate. Similarly, all three plant species retained more propanil than controls during post-amendment (8–48 h), but individual plant differences occurred with regard to clomazone and cyfluthrin retention. While variation in mitigation of specific dissolved components of nutrients suggests different mechanisms involved in nutrient cycling within our mesocosms, consistent overall total nutrient and pesticide reduction during the post-amendment period indicate that holding runoff in vegetated ditches may reduce transport of agricultural contaminants to downstream aquatic ecosystems.
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Authors thank Lisa Brooks and Renee Russell for sample analyses. The use of trade or corporation names in this publication is for the information and convenience of the reader. Use does not constitute an official endorsement or approval by the USDA or the ARS of any product to the exclusion of others that may be suitable. USDA is an equal opportunity provider and employer.
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Moore, M.T., Locke, M.A. Experimental Evidence for Using Vegetated Ditches for Mitigation of Complex Contaminant Mixtures in Agricultural Runoff. Water Air Soil Pollut 231, 140 (2020). https://doi.org/10.1007/s11270-020-04489-y
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DOI: https://doi.org/10.1007/s11270-020-04489-y