1, the whole pond work was not thorough in the early stage.
Culture of prawns in earthen ponds, especially if the sediment at the bottom of the ponds is too thick and not dredged for a long time, will have a great influence on shrimp culture in the future. However, if there is no sediment at all, it will also affect the problem that water quality is difficult to fertilize. Reasonable sediment also determines whether water can fertilize, which is a key.
2. Insecticides and disinfection did not detoxify in time.
The second problem that low-temperature water is difficult to fertilize involves the problem of detoxification. Surface water discharged by crops, sewage from factories and natural pollution. Therefore, after it enters the pond, we should pay attention to the problems of drug residues and heavy metals exceeding the standard after full sterilization.
3. Understanding of water bodies
It is difficult to fertilize water at low temperature, which mainly touches on the bottom of the pond. After a period of sun exposure, the benthic ecosystem has been seriously damaged, so the bottom of the pond is a buffer pool for algae in the water as a whole, and the supply of nutrients is continuous.
4. Don't blindly use low-fat aquatic products.
Don't think that adding more fertilizer at low temperature can't fertilize water. Before fertilization, we should cooperate with the application of microorganisms to promote the restoration of sediment ecosystem. Fertilization can slowly provide nutrients to algae in water, and artificial fertilizer is far from enough. So I suggest you cooperate with yeast, streptococcus faecalis, biological fertilizer, amino acids and so on. When fertilizing water, it is necessary to choose a variety of fertilized aquatic products and use them together, and the effect will be better.
5. Ignoring the importance of pond bottom fertilizer and water.
2-3 days after fertilization, algae are slowly enriched, so it is necessary to enter the water body in time and trace amino acids to allow algae to get a repair period. Therefore, low-temperature fertilizer and water are still few times. If you put too much fertilizer at one time, both liquid and powder will sink under the gravity of the earth, in order to cultivate algae. Most algae are suspended on the surface of water, with the position of 40-50 cm. If you want to fatten the water slowly, it is better to operate it as many times as possible.