Because of the large area of ​​water in the reservoir fish farming, the farmyard fertilizer can not meet the requirements of fertilizer and water, and it must be based on chemical fertilizers, which is effective.
The fertilization of reservoirs can promote the growth of phytoplankton and provide sufficient feed for squid and squid. Similar to the fertilization of crops, nitrogen, phosphorus and potassium must be properly matched, and there will be differences due to the species and quality of fish cultured. Nitrogen fertilizer is mainly composed of urea, ammonium sulfide, ammonium nitrate and ammonium bicarbonate, among which urea has the highest nitrogen content, and the efficiency is high. In the early stage of cultivation, the water body contains high amount of potassium, which can only apply nitrogen fertilizer and phosphorus fertilizer such as urea and superphosphate. The application of both should be 1:2. If ammonium bicarbonate is used, it should be an example of 2:1 with superphosphate. During the cultivation, a certain proportion of potassium fertilizer should be applied later, such as 70% of ammonium bicarbonate, 22% of superphosphate and 85% of potassium chloride. The fertilization of reservoirs must be preceded by the application of phosphate fertilizers followed by nitrogenous fertilizers. The order cannot be reversed and cannot be carried out at the same time to prevent the reduction of fertilizer efficiency or the production of toxic metaphosphoric acid. Do not apply granular or powdered raw fertilizers to prevent fish poisoning by poisoning. After dissolving and diluting, select the surface of the water with a good lighting condition and spray uniformly. The fertilization was stopped when heavy rainfall overflowed during the storm, and the spillway entrance should not be fertilized.
The fertilization time, quantity and water temperature are closely related, and the light is good. When the water temperature is above 20°C, the phytoplankton grows fast and is fully utilized within 7 to 10 days after fertilization. Therefore, the fertilizer should be applied every 7 to 10 days from June to September. The time of fertilization is selected from 8 to 10 o'clock in sunny morning. It is not suitable for rainy days. The time before and from the end of June to the end of September to November should be applied once every 10 to 15 days. The time and amount of fertilizer applied depends on the water quality and water temperature, and the transparency should be maintained at 40 cm or more.
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The main materials are rubber, PVC, etc.
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