How to chase fertilizer after fish farming
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Fat time. Generally good from 17 to 18 o'clock in the afternoon.
The amount of fertilization. About 1 meter depth of fish ponds, urea 1.5 ~ 2 kg per acre. Phosphate fertilizer 2.5 ~ 3 kg, single application of ammonia fertilizer or phosphate fertilizer are not good, the depth of 2 meters above the fish ponds or reservoirs, the appropriate amount of increase per acre.
Fertilization should be carried out in strict order. That is, first dissolve the phosphate fertilizer with water, and then dissolve the ammonia fertilizer in the phosphate fertilizer water. Before the ammonia fertilizer is fully dissolved, it can be poured into the water. Never directly spread the ammonia fertilizer (such as urea) into the fish pond.
Pay attention to spilled fertilizer points. Fish ponds should be distributed evenly sprinkle fertilizer points. In addition, the use of chemical fertilizers in deep water must be avoided. This is due to the fact that there is a large amount of pond soil mixed with deep water, and the ammonium ions of ammonia fertilizers are easily adsorbed and fixed to lose fertilizer efficiency.
The number of fertilization. Fertilizers are quick-acting fertilizers. When applying fertilizer, try to do it as little as possible, preferably every 4~6 days.
Observe after fertilization. After chemical fertilizers are applied in fish ponds, attention should be paid to observing the changes in the color of the pond water and the activities of the fish. If there are any abnormalities, timely measures should be taken to remove the fertilizer, add new water, and increase the water level.