The role of quicklime in pond culture Quicklime, also known as calcium oxide, forms calcium hydroxide (as an alkaline disinfectant) upon exposure to water, and releases heat, plays a role in sterilization, neutralization of organic acids in the pool bottom, and promotion. The role of anaerobic bacteria on the mineralization of organic matter in the bottom of the pool. Moreover, when calcium hydroxide encounters carbon dioxide, it becomes calcium carbonate, which is an ideal pH buffering agent that regulates and stabilizes the acidity and alkalinity of aquaculture waters. At the same time, calcium carbonate has pores that loosen the bottoms and improve the substrate's ventilation conditions. To promote the release of nitrogen, phosphorus, and potassium, which are adsorbed by silt, and increase the role of nutrients in water bodies. Second, a reasonable application of quicklime 1, depending on the amount of silt sludge ponds may be. If the sediment of the pond is muddy, the acidic bottom (such as sandstone and siltstone) is black, or the pond of the mangrove area is mostly acidic, and the amount of quick lime should be increased. . When clearing the pool, 200-300 kg/mu of quick lime can be applied. If the bottom of the pond is a sediment with less silt (eg, purple sandstone, carbonate rock bottom), use as little or no lime as possible. 2, depending on the growth of cultured organisms or the epidemic season of fish diseases. In southern China, during the high-temperature period from June to September in a year, the residual baits and excrement accumulation and corruption in aquaculture waters are likely to make the bottom layer hypoxic, the bottom substance acidic, and the bacteria multiply. In the high-temperature season, the period of disease is frequent, and then quicklime should be applied as much as possible. 3, depending on the type of pond fertilization, quantity and color. Applying organic fertilizer for many years, when the pond water is dark green, dark brown, brownish black, and grayish white, quicklime should be applied and at the same time fresh water should be replaced. Lime is used once a month at a rate of 13-25 kilograms per mu. Third, the lime should not be applied to the water body 1, the bottom of the sediment is a new pool of mud, less silt, the aquaculture water in the organic matter is not much, if the use of quicklime clear pool, will make the pool of organic matter decomposition intensify, accumulation more As a result, the fertility is further reduced and recovery is very difficult. Therefore, quicklime is generally not used. 2. For water bodies with more calcium and magnesium ions, it is generally not appropriate to use quicklime. Because the application of quicklime increases the concentration of calcium ions in the water, and these calcium ions will precipitate the phosphorus in the water as calcium phosphate, resulting in the lack of phosphorus in the water, which will cause the imbalance of nitrogen and phosphorus in the water, affecting or even limiting the aquatic The growth of plants ultimately affects our control of the aquaculture water colour.