Hypolimnion Injection of Nutrient Effluents as a Method for Reducing Eutrophication. Schindler, D., W., Ruszczynski, T., & Fee, E., J. Canadian Journal of Fisheries and Aquatic Sciences, 37(3):320-327, 1980.
Hypolimnion Injection of Nutrient Effluents as a Method for Reducing Eutrophication [pdf]Paper  abstract   bibtex   
Injection of nutrients into the anoxic hypolimnion of a small Precambrian Shield lake for 5 yr caused less of a eutrophication problem than discharging nutrients into surface waters. Phytoplankton standing crop and production in the whole lake averaged only 10–21% of values in a nearby lake fertilized at the surface. Five-year averages for the epilimnion only were still lower: 5–8% of those in the surface-fertilized lake. Analysis of long-term trends in chlorophyll and nutrient concentrations revealed much slower rates of increase than in surface-fertilized lakes.

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