In spring, the water temperature is relatively low, the sun is generally insufficient, and algae generally do not grow well. In addition, aquatic animals such as fish and shrimp grow slowly at low water temperature, and the dissolved oxygen requirement for water bodies is not as high as the high temperature period. Therefore, the water body's fatness is not taken seriously. In fact, it is still necessary to supplement the nutrients to the water body at relatively low temperatures.
Algae is the original producer in the water body, and it is the most basic and important part of the aquatic food chain. At the same time, the photosynthesis of algae also provides about 75% of dissolved oxygen in the water to ensure the normal breathing needs of farmed fish and shrimp. If the water body is not rich enough, if the algae does not grow well and the dissolved oxygen is insufficient, the water environment will be deteriorated, the water body nutrients will not be able to circulate normally, and a large amount of ammonia, nitrite, and hydrogen sulfide harmful substances will produce a large amount of deposition, resulting in the occurrence of diseases. It will cause a large number of aquatic animals to die. Therefore, we must pay attention to the fertilizer and water work during the cold season in spring. This can provide sufficient dissolved oxygen in the water, promote the normal circulation of the pond, provide suitable food, reduce irritation, reduce disease incidence, and reduce death.
Low-temperature fertilizer method
1. When the temperature is low in spring, choose sunny water with a temperature above 8°C.
2. The fermented liquid or pasty Amino Acid and carbohydrate fertilizers are selected and used once every 7-10 days according to the normal fertilization standards. If the culture density is high and the transparency is high, the application amount can be increased.
3, for ammonia nitrogen, nitrite normal water body, you can choose amino acid fermentation mainly; ammonia nitrogen and nitrite higher water body, you need to choose carbohydrate fermentation of fertilizer-based.
4, avoid using ordinary solid fertilizer fertilizer. Normal fertilizers have poor solubility in the low temperature period, the release of nutrients is too slow, the degree of microbial decomposition is insufficient, and it is impossible to use effective fertilizers. Organic matter that cannot be used for a long time will become contaminants in the pool instead.
5. If the water body disinfectant, insecticide, and clear pond agent are used excessively, causing a large number of algae to die, it is recommended to change the water or use a suitable antidote to detoxify and then apply fertilizer.
6. If there are too many zooplankton in the water, a large amount of algae will cause insufficient algae and the water will be whitened.
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