Fertilizers are natural or synthetic substances that are used in ponds to increase the production of the natural food organisms to be eaten by the fish. These organisms include phytoplankton, zoo-plankton and insects. It results the increase in availability of major nutrients.
Optimum dose of fertilizers (inorganic or organic or combined) is always the question in pond fertilization. Less fertilizer decreases the production of fishes whereas over dose of fertilizers not only increases the production cost but also increase physiological problem in fishes. This tools determines the optimum dose of Urea, DAP and Manure to be applied in the specified pond at the given days interval.