compound fertilizer water should be used in fish ponds at a time? 7.5 kilograms of compound fertilizer water should be used in fish ponds per mu, and then 4 kilograms should be applied every other week. The purpose of fertilization in fish ponds is to promote the reproduction of plankton, some of which can be used as feed for fish, and some of which can improve water quality, not only absorb harmful substances in water, but also release a certain amount of oxygen, thus helping the development of fish.
for fertilization of fish ponds 1. Fertilization time: Fertilization of fish ponds should first pay attention to fertilization time, usually 7-15 days before the release of seedlings, and the water temperature should be above 15 ℃. After disinfection of the pond, sufficient base fertilizer should be applied at one time. When the water temperature rises to 20-30 degrees Celsius, it is necessary to apply fertilizer appropriately according to the water quality. If the temperature exceeds 30 degrees Celsius, the fertilizer should be stopped.
2. Amount of fertilization: It is necessary to control the amount of fertilizer to fertilize the fish pond. If there is less silt in the fish pond, it is necessary to apply base fertilizer to it. Usually, it is appropriate to apply topdressing according to the shade of the water color. Usually, in the high temperature season, the number of topdressing should be increased, but the amount of each time should be reduced. The opposite is true at low temperature.
3. Fertilization contraindication: If the water is turbid, do not apply fertilizer. The turbid water will fix and precipitate the nutrients in the fertilizer, which will affect the fertilizer efficiency. In addition, do not apply fertilizer when the fish and shrimp are not eating well or are sick. Fertilization is easy to bring down algae, which will cause certain deterioration to the water quality.
