New Pond Considerations
The newly excavated Tangkou, due to the removal of the original soil layer and the excavated Xintang at the end of the pond, it is best to set aside enough time to absorb the water, then drain it out, then refill the pool, and then discharge it. This is repeated 2 to 3 times. Each time the lagoon is kept for about one week, it is then sun dried to increase the oxidation state of the soil.
If the pH of the Xintang soil is less than 6.5 and the alkalinity of the cited source is relatively low, the bottom of the pond must be alkalized to maintain the pH of the pond soil between 7-9 to ensure the total alkalinity and total hardness. Both are above 80 mg/l (calculated as calcium carbonate) so as to ensure that enough dissolved carbon dioxide is released for algae growth. Acidic sulphate ponds, in China's coastal areas, especially in Guangdong, Guangxi, there are many ponds built in the mangrove area, the mangrove area soil is acidic sulfate soil, due to the acidity of the acidic sulfate soil is too strong, not suitable for direct culture , And it is difficult to achieve the purpose of adjusting the pH value by directly using lime treatment. Treatment of such ponds also requires membrane isolation or multiple alkalization.
The identification of acid sulfate soil can be identified by the sulfur content (greater than 0.75%) or pH value (2 to 3) of the pond soil after drying for several days. The identification method of the acid sulfate soil in the field is: using several grams of fresh The soil is mixed with 10% to 30% hydrogen peroxide solution (hydrogen peroxide). After about 10 minutes, a broad-spectrum pH test paper (0-6) is placed in the soil and hydrogen peroxide mixture to insert the pH test paper tip. The edge of the mixture allows the liquid to absorb moisture along the test paper. If the color of the test paper changes, the pH is no more than 3, and the soil is acidic sulfate soil. This soil has a lot of grayish yellow spots, and the surface is drained to dry the surface slightly. It is red.
Alkaline treatment of acidic sulfate soils:
1. In the early days of the dry season, the bottom of the pond is thoroughly dried and plowed.
2. Infuse brackish water, frequently measure the pH of water, the pH of the water will decrease from 7.0-9.0 to below 4.0. When the pH is stable, drain the pool water and repeat the process until the pH is stable above 5.0. Three or more irrigation cycles are often required.
3. At the same time as the improvement of the pond bottom, the acidity of the surrounding dam bank must be removed. In order to facilitate the operation, the top of the bank should be leveled and a small bank should be built along the edge of the bank to form a shallow pool filled with salt water. When the pond is drained and drained, the water in the pool on the bank will be drained and dried, if necessary. Repeat the operation. Finally, clear the embankment and sprinkle lime at 1 kg to 2 kg/m2 on the top and sides of the embankment.
4. Once the irrigation and drainage cycle is completed, lime is sprinkled at the bottom of the pond at a rate of 30 kg to 40 kg/mu, and then fertilized as needed to promote the reproduction of phytoplankton.
5. In order to prevent point acidity, it is necessary to frequently check the pH value, if necessary, alkalinization or film protection.
Laotang needs to deal with the reasons
After a period of aquaculture production, shrimp culture ponds tend to deposit a thick layer of organic matter at the bottom of the pond, including organic waste such as shrimp excrement, residual bait, dead algae, zooplankton or shrimp corpses. When these organic wastes are decomposed, they need to consume a large amount of dissolved oxygen. If they accumulate too much, they will cause the shrimps in the grow-ups to float or die. In the case of hypoxia and hypoxia, the underlying organic waste cannot be completely decomposed or cannot be decomposed, and then some highly toxic intermediate metabolites such as histamine, putrescine, and hydrogen sulfide are easily generated, which seriously threatens the survival of the shrimp. .
Penaeus is a benthic organism, and its main places for feeding, growing, shelling, and inhabitation are at the bottom, so the requirements for the bottom environmental conditions are high. Therefore, in order to ensure the smooth progress of aquaculture production and improve the success rate of shrimp aquaculture, it is imperative that the desilting and remediation of ponds be effectively carried out after aquaculture.
However, the acidic sulfate soils in the mangroves are not suitable for exposing the ponds and removing the sediment. Conditional farmers should change their formulas (ie, use different doses of lime to improve the sediment quality of the ponds based on different soil test results). 10 cm of influent water is sterilized for 3 days and then the organism is changed to the bottom, that is, to cultivate beneficial bacteria before the algae cultivation, and to promote the growth of beneficial microorganisms, such as the use of spores and EM bacteria. After the pond is disinfected, the formula is changed to the bottom, and the organism is changed to the bottom, the algae can be fertilized.
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