Abstract
Abstract A liquid fertilizer (Poly N; Allied Chemical Corportion) with an N:P2O5:K2O ratio of 10-34-0 and a granular fertilizer (fish pond fertilizer, 20-20-5) were applied to fish ponds. Poly N at 6.6 kg/ha per application and fish pond fertilizer at 45 kg/ha per application were both effective in promoting phytoplankton growth in sportfish ponds. Nutrient inputs were much lower with Poly N, and a savings of $9.50/ha per application was achieved.
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