Fish pond hanging bag fertilization

Fertilizer cultivation in nursery ponds, if the whole pool spread, although the fertilizer effect is fast, but the role of time is short, many of the fertilizer has not yet completely dissolved tiny particles, easily eaten by the fry, affect the survival rate of fry. If chemical fertilizers are put into plastic woven bags to allow them to dissolve and diffuse naturally, they will not only have stable fertilizer effect, low cost and light labor intensity, but they will continue to provide essential nitrogen and phosphorus elements for phytoplankton, promote the growth and reproduction of plankton, and provide fish fry A large number of palatability natural foods to improve the survival rate of fry cultivation.

1. Choose a sunny day bagging fertilization time should be between 9 o'clock and 4 o'clock in the afternoon, when the light is strong, the temperature is high, the photosynthesis of phytoplankton is strong, and the effect is good.

2. Nitrogen and phosphorus are the indispensable nutrients for the growth and reproduction of phytoplankton. Commonly used nitrogen fertilizers are ammonium bicarbonate, urea, etc. Phosphate fertilizers include superphosphate, calcium magnesium phosphate, and so on. For a depth of 1 meter in a fish pond, each 667 meters 2 (1 acre) each use ammonium bicarbonate 4-5 kilograms, superphosphate 4 kilograms or urea 2-3 kilograms, superphosphate 4 kilograms. Such as calcium magnesium phosphate fertilizer for 4-5 kg.

3. How to use the fertilizer into the bag, let it dissolve and spread naturally. 1 Each 667m2 can be hung about 4 plastic woven bags (1 snake skin bag can be cut 4 pieces), and the nitrogen and phosphorus fertilizers are respectively put into the bags, and they are hung in the fry pool water, 20 centimeters from the water surface. Do not mix nitrogen and phosphorus fertilizers in the same bag, as the nitrogen fertilizer absorbs heat and dissolves quickly and easily reacts with phosphate fertilizers to reduce fertilizers.

2 Phosphate dissolves slowly, can hang more 1-2 bags, but can't hang bags with nitrogen fertilizer at the same time, it is better to hang phosphate fertilizer in the morning and hang nitrogen fertilizer in the afternoon.

3 bag hanging times. Usually 3-5 days 1 (depending on the water fat thin and set), when the fish pond into the new water, it is necessary to hang bags, and increase the number of bags. In the past, we used topdressing to top-dress, not only the cost, but also the survival rate of fry is only about 30%. After using bagging fertilizer in the past two years, the surviving rate of surimi increased to more than 50%. Not only do the fish fry have the same specifications and robustness, but they also increase the utilization of chemical fertilizers.

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