Abstract
We tested a granular, water-soluble, sodium-nitrate-based fertilizer (8% N, 24% P2O5, 15% K2O, and trace elements; per application rates of 8 and 16 kg/ha) for potential use in freshwater sport fish ponds and compared it with a liquid fertilization program commonly used in the United States. At 16 kg/ha application, the sodium-nitrate-based fertilizer was as effective as the liquid fertilizer in increasing net phytoplankton productivity and sunfish production. This granular product can be broadcast directly over pond surfaces because it quickly dissolves in the water and does not settle to the bottom as rapidly as normal granular fertilizers. Nitrate is a good nitrogen source for ponds because it is not acid-forming, it does not increase oxygen demand, it will not increase un-ionized ammonia concentrations, it can oxidize bottom soils, and it is not objectionable in effluents. This new fertilizer has excellent possibilities as a fish pond fertilizer.
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