The main purpose of fertilization is to increase the nutrients in the water, so that the plankton grows moderately, so as to increase the natural bait of the fish and ensure the high yield of the fish. The types and methods of topdressing are as follows:

Human and animal manure application method

The collected human and animal manure is diluted with appropriate amount of fresh water, and then slowly splashed around the pond water to increase the pond water body fat and cultivate fish food organisms. The number of topdressing varies depending on the type and size of the fish, and it can be easily grasped based on the water quality and temperature. Fertilizer topdressing must undergo fermentation and strict disinfection.

Domestic sewage treatment method

Domestic sewage is non-toxic waste water used in the processing of agricultural and sideline products or in people's lives. It contains a variety of organic matter. Using domestic sewage as fertilizer can save feed. At the time of application, the domestic sewage is first precipitated to remove the residue and then injected into the pond. The amount of application differs depending on the concentration of the sewage. Since the domestic sewage is more turbid, it is prone to lack of oxygen. Therefore, ponds that require domestic sewage are not easy to get too deep. At the same time, the amount of dissolved oxygen in the pool should also be constantly measured to control the effluent and avoid the death of the fish.

Mixed composting

Its main fertilizer components are grass, quicklime, feces and so on. Methods Firstly, the grass and manure are put into the fermentation pit according to a certain proportion, plus a certain amount of quick lime, a layer of grass, a layer of quick lime, a layer of manure is loaded in order, and water is added until the fertilizer is safely immersed in water. The above is sealed with mud, so that it can be fermented, ready to use after decomposing, and how much to apply according to the water color and water temperature of the pool water.

Inorganic fertilizer spill

In fishery production, commonly used inorganic fertilizers are nitrogen, phosphorus, potassium, etc., and the ratio of general chemical application is 1:1:0.50. At the time of application, the fertilizers were first crushed and mixed with water to dissolve the whole pool. The amount of fertilizer used is usually 4 to 5 kg of nitrogen fertilizer and phosphate fertilizer, and 2 to 2.50 kg of potassium fertilizer.

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