Nutrient addition continued in the second year of a four-year pilot project at a rate of 600 mg P/m2/6mo and 2258 mg N/m2/6mo (8.5:1 N to P atomic weight ratio). Agricultural grade fertilizers, ammonium phosphate (11-55-0) and ammonium nitrate (34-0-0) were added weekly to a floating screen bottomed (180 um) box anchored in the deep end of the lake from April 14 to September 29, 11986. The nutrients were thus held in the epilimnion while dissolving, and sampling indicated that they dispersed throughout the entire surface waters. Summer phytoplankton densities averaged 8 times higher in Salsbury Lake (8.1 µg Chl a/L) than in nearby control lakes (0.8-1.3 µg Chl a/L). Phytoplankton started to bloom one month earlier than in 1985 when fertilization didn't start until May 22, and 1986 averaged much higher summer densities than 1985 (4.2 µg/L). Fish samples were collected for comparison of growth rates with previous years, but analysis is not yet completed.
Hume, Jeremy M.B.. 1987. Habitat Conservation Fund Progress Report (1986-1987) Salsbury Lake Fertilization. Ministry of Environment and Parks. Fisheries Project Report. FPR13
Topic: Fish and Fish Habitats
Keywords: Salsbury Lake, fertilization, phytoplankton
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