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使用不同种类的石灰,主要是增加养殖水体的缓冲能力,并提高pH。本文着重讨论水质管理中不同种类石灰的作用。一、石灰的种类1.农用石灰或石灰石即碳酸钙,是由石灰石简单粉碎而得。养殖中所使用的石灰,其碳酸盐含量不应低于75%,粉碎较细的石灰非常适宜养虾池使用,多用于增加养殖水体的缓冲能力。因其对pH没有大的影响,可相对大量使用,正常使用量为100kg/公顷～300kg/公顷。2.熟石灰即氢氧化钙,由在大约800℃～900℃温度下烧炼石灰石而制得,燃烧后需往热的石灰石上加水。熟石灰用于增加养殖水体或土壤的pH,使用量一般为50kg/公顷～100kg/公顷。由于熟石灰对pH有一定的影响,而养虾池多在下午pH达到最高,因此建议不要在下午施用。
The use of different types of lime, mainly to increase the buffering capacity of aquaculture water, and increase the pH. This article focuses on the role of different types of lime in water quality management. First, the type of lime 1. Agricultural lime or limestone that calcium carbonate, limestone is simply crushed derived. Lime used in aquaculture, the carbonate content should not be less than 75%, crushed lime is very suitable for shrimp ponds, used to increase the buffering capacity of aquaculture water. Because of its pH does not have a significant impact, can be relatively large amount of use, the normal use of 100kg / hectare ~ 300kg / hectare. 2. Hydrated lime, calcium hydroxide, is prepared by burning limestone at a temperature of about 800 ° C to about 900 ° C. Water is added to the hot limestone after burning. Hydrated lime is used to increase the pH of the aquaculture water or soil and is typically used in an amount of 50 kg / ha to 100 kg / ha. Since hydrated lime has a certain effect on pH, the shrimp ponds have the highest pH in the afternoon and are therefore not recommended for use in the afternoon.