Lime clear pond has many advantages such as broad spectrum of efficacy, low cost, water quality regulation, improved bottom quality, protection of calcium absorption in fish, promotion of fish growth, prevention of fish osteomalacia, malformation, and environmental protection. However, the amount of blindness and improper methods are often twice as effective and even worse.
The thickness of silt at the bottom of different ponds is different, and the composition of silt is also different. In addition, some of the ponds themselves are alkaline and acidic. Therefore, the use of quick-lime ponds is not "better." The use of quicklime should be due to the pool. After the quicklime is used, the pH of the pool water exceeds 10 or more and does not decrease within 2 hours, so that the effect of killing fish pathogens and predator organisms can be obtained. Excessive use of quicklime will not only increase the cost of breeding, but will also be a waste. It will also lead to the loss of some nutrients in the water. For example, the phosphorus in the water will become insoluble apatite, which will lead to the lack of phosphorus in the water, thus inhibiting phytoplankton. Even zooplankton grows and reproduces, resulting in reduced production of fish and shrimp. Second, blindly increasing the amount of quicklime can also significantly increase the toxicity of ammonia in water. When the water temperature is between 15°C and pH 6-8, the pH increases by 1 and the toxicity of ammonia nitrogen increases by a factor of 10. The greater toxicity delays the growth of fish and shrimp, and the severe toxicity threatens the life of fish and shrimp. In addition, fish are suitable for growth in slightly alkaline waters with a pH of 7.5-8.5. If the pH is lower than 6.0 or higher than 9.0, it will have an adverse effect on fish. Therefore, excessive use of quicklime causes the pH value of the water body to be too high, which is totally unfavorable for fish growth.
Dry pond clear pond is generally used for the amount of 100 kg -150 kg per mu; water clear pond with an average depth of 1 meter, with 120 kg -150 kg. When the water temperature is lower, due to poor efficacy to increase the amount, such as early spring water temperature 3 °C -5 °C appropriate increase in the amount of 20% -30%. "Chenchi Laotang" should make more use of freshly dug ponds; more acidic soil ponds can be used, and less soil ponds are less effective; organic fertilizer ponds can make more use of inorganic fertilizer ponds.
Practice has proved that the clear pond with water not only saves labor and its effect is better than that of dry pond clear pond. The specific method is to put quicklime into the basket, suspend it on both sides of the hull, sink into the water, and manually shake the basket so that the effective part of the lime is fully melted in the water. . Dry pond clear pond, must be "hot iron", in the lime absorbent melt, ranging from the cooling that is spilled around. Whether it is dry pond clear pond or water clear pond, strive to be uniform, otherwise, the efficacy is difficult and expected. Qingtang time should be selected from noon until 4 o'clock in the afternoon. The low temperature of rainy weather will affect the effect and should not be carried out.
Quicklime can not be used together with bleaching powder, copper sulfate, and trichlorfon, because the quicklime encounters bleaching powder and copper sulfate will neutralize and invalidate or weaken the efficacy; the quick lime will increase the toxicity by several times.
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