Fertilization methods and matters needing attention in fish ponds How to fertilize fish ponds and matters needing attention

1. Choose the right fertilizer: there are two kinds of fertilization for fish farming: base fertilizer and topdressing. Before the fry went down to the pond, some old fish ponds had good soil and could be watered and fertilized without applying base fertilizer. Topdressing is applied in the breeding process, and the application time is uncertain. It is generally observed that topdressing can be applied when the transparency of water quality is above 45 cm. It can be said that the application of topdressing is accompanied by the whole fish farming process. In the process of aquaculture, the water quality should not change too much, so as long as the water body is transparent and the water quality is thin, fertilization should be applied quickly, so that the water quality can be fertilized quickly to meet the needs of the fish growth environment. However, manure and other organic fertilizers are usually used to apply base fertilizer, and fertilization and watering are slow. If you want to fertilize water quickly, you need to use inorganic fertilizers, such as nitrogen fertilizer and phosphorus fertilizer, which is what we usually call chemical fertilizer. Of course, biological fishery fertilizer has been developed, which is more targeted and can cultivate a large number of palatable algae and zooplankton. At the same time, adding beneficial microorganisms, substrate and water quality improver into biological fishery fertilizer not only enriches water, but also improves substrate and adjusts water.

2, pay attention to fertilization time: fertilization should also master the weather conditions, fertilization under inappropriate weather conditions, not only can not achieve the effect of dual use of fertilizer and water, but also cause the loss and waste of fertilizer. You can pay attention to the weather forecast in advance and choose 9- 10 fertilization in the morning of continuous sunny days. At this time, the water temperature will not be too high, the dissolved oxygen is sufficient, and fertilization is the most suitable.

3, adhere to the principle of a small number of times: some friends see that the water quality is thin, they will fertilize indiscriminately. You know, excessive fertilization will not only cause eutrophication, but also cause fish floating and diseases. When using inorganic fertilizer as topdressing, the dosage is about 3 kg per mu. According to the transparency of water, just apply it every 10- 15 days/time.

4. Pay attention to the ratio of nitrogen, phosphorus and potassium: the disadvantage of chemical fertilizer is that the elements are single and the species of plankton cultivated are also single. This is in contradiction with our requirement that the species and structure of plankton in fish ponds are rich. In order to cultivate a variety of phytoplankton, it is best to use nitrogen, phosphorus and potassium together. Generally, the ratio of nitrogen, phosphorus and potassium is 1: 1:0.5. If only nitrogen fertilizer and phosphorus fertilizer are used, the best ratio is 1: 1.

5. Pay attention to the application sequence: apply phosphate fertilizer first, then nitrogen fertilizer, and the order cannot be wrong. On the one hand, it is to avoid poisoning fish by producing toxic substances out of sequence, and on the other hand, it is to avoid reducing fertilizer efficiency.

6, pay attention to the application of water: inorganic fertilizers can not be directly sprinkled into fish ponds, but should be turned into water and then evenly sprinkled. The fertilizer should be melted before spreading, so as not to reduce the fertilizer efficiency.

7. Pay attention to collocation taboos: Inorganic fertilizers should not be used together with alkaline fertilizers such as plant ash and alkaline drugs such as quicklime. If the fish pond is disinfected with quicklime, it should be fertilized every 65,438+00 days or more.

8. Be careful not to fertilize when the fish is sick: when the fish is sick, its physique is weak. After fertilization, the PH value will generally increase and the local water temperature will change. Therefore, fertilization should be avoided when the fish is sick, so as not to aggravate the fish's condition. In addition, fish will take medicine when they are sick, and the medicine we use may also react with fertilizer, thus reducing the efficacy or releasing harmful substances. Fertilize the fish after their condition is stable.