Summer is in the high temperature season, which is the period when the maximum amount of feed is also the period when fish grows vigorously and the fish consumes large amounts of oxygen. To promote the application of organic fertilizer, inorganic fertilizer should be used to reduce the pollution to the pool water. In summer, the nitrogen content in the pond water increases, but the phosphorus element content is very low. Therefore, when the chemical fertilizer is applied during the high temperature season, nitrogen fertilizer is generally not used, and mainly water-soluble phosphorous fertilizers are used, and superphosphate is usually used. Observe the following points when applying:
1. Application method
Due to the high temperature of pond water in summer, especially when the water temperature is higher than 30°C, the effect of chemical fertilizer application will be reduced and should be less. When the water temperature is higher than 34°C, it should be stopped. Fertilization It is best to dissolve the phosphate fertilizer and then use a sprayer to spray it on the water or spray it evenly. Should choose sunny morning 9 to 10 when Quanchiposa. The general application of calcium phosphate once a month 2 to 3 times, each time the amount of 5 to 6 kg per acre. When fertilizing, the upper and lower water layers are not easy to convective, so that the upper layer of water-soluble phosphate fertilizer can maintain a higher concentration, while the phytoplankton also began to concentrate to the pool water layer to absorb phosphate fertilizer, greatly improving the utilization of water-soluble phosphate fertilizer.
2. Precautions
Do not stir the pool on the day of fertilization (including pulling nets, adding water, and starting aerators, etc.) to prolong the suspension time of water-soluble phosphate fertilizers in the water and reduce the absorption and fixation of phosphorus by the pond sludge. Generally, after 3 to 5 days of application of phosphate fertilizer, the phytoplankton in the pond will have a peak and the ammonia nitrogen content will drop. At this time, according to the water quality management requirements, new water should be added properly to prevent the water from being over-concentrated. In addition, if quicklime is applied, it should be applied at least 10 to 15 days before applying phosphate fertilizer. Otherwise, effective phosphorus is likely to form calcium salts and reduce fertilizer efficiency.
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