Abstract
Phosphorus (P) concentrations in water and sediment of a highly eutrophic lake were monitored before and after application of diquat to control the macrophyte Potamogeton crispus. Only a relatively small and short-term increase in P concentration in water occurred shortly after plant die-off resulting from herbicide application. Phosphorus concentrations in shallow water sediments decreased during the summer, and those in deep water sediments increased. Although a large increase in P concentration in the water occurred in late summer, it was not attributed to diquat. No major secondary effects of herbicide application were found during this study.
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Michaud, M.T., Atchison, G.J., McIntosh, A.W. et al. Changes in phosphorus concentrations in a eutrophic lake as a result of macrophyte-kill following herbicide application. Hydrobiologia 66, 105–111 (1979). https://doi.org/10.1007/BF00032039
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DOI: https://doi.org/10.1007/BF00032039