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uepenaing on tne water quality of the individual pond, up to ten applications may be required each year for a period of one to five years.
Both the rates and the timing of the treatments are strongly influenced by local environmental conditions and will vary considerably between seasons and through the years depending on the physical factors (surface area, depth, temperature, light, water clarity, rainfall), chemical factors (ph, dissolved oxygen, hardness, alkalinity, nutrient concentrations), and biological factors (kinds and amounts of algae, rooted weeds, fish and other aquatic life forms).
Because each pond is a unique complete ecosystem, the results of fertilization are largely unpredictable even under the best circumstances. Claims that pond owners can cheaply produce up to ten times as many sport fish by simply adding a bit of fertilizer are completely misleading.
The potential benefits of fish pond fertilization have been enthusiastically over-rated, while the costs, complexities, and real dangers are often suppressed in the popular literature. Our best advice is to keep fertilizers on agricultural lands and out of pond water.
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