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District Fisheries Biologist tarville S. Prosser, who just :ompleted a two year study of .he available formulas. Prosser’s esearch indica ted "that liammonium phosphate [21-53-0) used at about half of Die regular rate for 20-20-5 produced the same increase in fish food and its effects lasted onger. The diammonium phosphate is a crystaline chemical which dissolves almost instantly, J factor that Prosser and others involved in the research think may be largely responsible for its effectiveness. The research was carried out at the Game Commission’s Lake □ range facility. Lake water confined in plastic tubes immersed in the lake was treated regularly with precisely calculated quantities of all major fertilizer
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