Pay attention to the lack of oxygen in the pond in the spring

The main source of dissolved oxygen in ponds is the absorption of sunlight by phytoplankton in water bodies for photosynthesis. In early spring, it is often overcast and rainy. The main source of oxygen in the pond is cut off and it is easy to cause hypoxia in the pond. When oxygen is deficient, the decomposition of organic matter is inhibited, the circulation of the water is destroyed, the regeneration of nutrients fails, and the conversion of ammonia falls into a pause, and toxic substances such as hydrogen sulfide, ammonia nitrogen, nitrite, and methane are produced. In this way, the growth and reproduction of plankton are limited due to the shortage of nutrients, so that the entire pond water body can easily enter the water quality deterioration stage. Therefore, we must do a good job in preventing the lack of oxygen in the pond as soon as possible:

First, timely new water

For some old water ponds, the addition of good new water is the most important measure. Dilutes toxic metabolites in pond water by adding new water and brings in nutrients needed for growth of oxygen and plankton, such as iron, manganese, and silicon. The specific approach should be based on the pool's fatness, weather conditions, pool water level flexibility, generally every 10-15 days, add water, each adding 30 centimeters of water.

Second, a reasonable start aerator

1, cloudy open aerator time: At this time the role of open aerator is a direct increase in oxygen, because the ability to photosynthesis is weak, the pool of oxygen reserves is very small, especially in the early morning pond fish easy to float head. 1 Normally, the power is turned on at 3-5 o'clock in the early morning when the power is turned on. If it is a continuous rainy day, it is necessary to turn on the aerator until dawn at night, and it is necessary to determine the turn off time according to the fish activity. 2 In cloudy and rainy days, it is not turned on. Because the pond's thermal stratification (cold and hot stratification) is not obvious due to rainy days, the dissolved oxygen in the surface water is not saturated. At this time, the water splashing is not positive, and it will affect the photosynthesis of phytoplankton. . Therefore, it is generally not turned on during rainy days unless the fish need direct oxygenation at the floating head.

2. Open aerators at noon on sunny days: There are not many days of sunny days in early spring, and it should be used in due course to open more aerators to improve pond sediments. The purpose of starting up at this time is to stir the water, break the thermal layer, eliminate the oxygen debt of the bottom water, and increase the reserve of dissolved oxygen in the pond. The boot time is 0.5-1 hour from 12:00 to 14:30.

Third, rational regulation of fertilization

The main source of oxygen in the pond water is the photosynthesis of phytoplankton. The growth of phytoplankton requires a certain amount of nutrients. Therefore, it is necessary to provide fertilizer through fertilization. Fertilization in early spring is mainly chemical fertilizer (3 to 4 kg/mu. Once a week), less organic fertilizer is used because organic fertilizer is not easy to ferment before application, and it takes a large amount of pond oxygen to ferment after application, which is extremely unfavorable to pond fish. Therefore, it is necessary to check whether the fermentation is complete before applying organic fertilizer.

Fourth, control the amount of plankton

Early spring is the beginning of the vigorous growth of zooplankton. A large number of zooplankton ingest phytoplankton, which easily affects the quantity of phytoplankton, and thus affects the source of oxygen. On the other hand, a large amount of zooplankton also consumes too much oxygen. Therefore, the amount of zooplankton should be properly controlled: 1 put more large-size carp ahead of time to eat. 2 kill with drugs.

Fifth, other methods of regulating water quality

1, application of photosynthetic bacteria

Although photosynthetic bacteria are slow in action, their efficacy is stable and safe. It uses the accumulated feces and residues as nutrients to decompose, reduce ammonia nitrogen, improve water quality, and suppress fish diseases, insects, and bacteria. After 10 days of application, photosynthetic bacteria gradually lose their effect and must be used once every 12 to 15 days.

2, regular application of quicklime or coarse salt

Quicklime 5 to 10 jin per mu or coarse salt 10 to 20 jin/mu can combine with suspended matter in water to precipitate and supply nutrients for phytoplankton growth, reducing the effects of various toxic substances and improving water quality (this amount cannot be used as Sterilization).

3, application of water quality improver

There are many water quality improvers on the market and they can be purchased according to the actual situation. Its main components are thiosulfate sodium, activated carbon, alum (aluminum potassium sulfate), potassium dihydrogen phosphate, talcum powder, humic acid, acetic acid, potassium dichloride and other types. Some farmers use some oxygenating agents to regulate water quality and have certain effects.

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