Biogas manure is a highly efficient liquid nutrient that is neutral and contains a large amount of readily available nitrogen, phosphorus, potassium, amino acids and trace elements. The use of biogas fertilizer to fish not only saves bait but also significantly increases the yield of fresh fish. The specific method is as follows.
First, stocking fish species. It is advisable to stock filter-feeding fish (eg carp, squid, etc.) and food-eating fish (eg grass carp, squid, etc.) and omnivorous fish (eg carp, squid, etc.).
Second, stocking density and species mix. Determine the stocking density and the mix of breeds based on pond water quality, fat and water conditions, and if the water quality can be replenished with fresh water at any time, mainly for stocking turtles and grass carp, the amount of stocking should be controlled at 1000-1500 tails/mu, accounting for the total stocking. The amount of 60% -70%, of which carp accounted for 30% -35%, carp accounted for 10%, grass carp accounted for 20% 25%. The omnivorous fish stocking rate is controlled at 800-1000 tails/mu, accounting for 30%-40% of the total stocking amount, among which carp accounts for 15%-20%, carp accounts for 10%-15%, and tilapia accounts for 5%.
Third, the specifications of stocking fish species. It is required that the size of the fish be even and the specifications should be large. The squid and squid should preferably be given 0.1-0.25 kilograms of the second-instar fish species. The minimum size should not be less than 12 centimeters. The grass carp should be 0.25-0.5 kilograms of the second-instar species. Less than 15 cm, salmon, mackerel, and tilapia must not be less than 6 cm.
Fourth, the amount of marsh fertilizer. The application of biogas fertilizer should be carried out on a sunny day. Generally, the amount of biogas slurry discharged per acre does not exceed 250-300 kilograms per day, and the amount of biogas residues discharged per acre does not exceed 100-150 kilograms per day. Fertilizer is applied once a day. If the weather is hot, the transparency of water is 20 centimeters (to a white object After being fixed at one end of the bamboo rod, insert it into the water until no white color is visible. If the length of the bamboo rod immersed in water is measured as transparency, then apply it once every other day or 2-3 days. The weekly application should not exceed 3 times. In the application process, the amount and frequency of fertilizer application can also be adjusted according to the change of the transparency of the water color. In general, in April, May, October and November, the water color transparency is not less than 20-25 cm. In June, August, September, the transparency of water color is not less than 10-15 cm.
V. Daily management and precautions
1. The application of biogas fertilizer mainly takes the fish floating head for a long time, and it quickly sinks after sunrise. If it does not sink after sunrise, it should be filled with fresh water or other oxygenation measures.
2. Apply more on sunny days, less on cloudy days, stop on hot days or before thunderstorms. Foggy weather should be applied after the fog.
3, the application of biogas fertilizer should be cast Qing feed.
4. It is strictly forbidden to use biogas fertilizer from biogas digesters that are poisoned but do not produce gas.
First, stocking fish species. It is advisable to stock filter-feeding fish (eg carp, squid, etc.) and food-eating fish (eg grass carp, squid, etc.) and omnivorous fish (eg carp, squid, etc.).
Second, stocking density and species mix. Determine the stocking density and the mix of breeds based on pond water quality, fat and water conditions, and if the water quality can be replenished with fresh water at any time, mainly for stocking turtles and grass carp, the amount of stocking should be controlled at 1000-1500 tails/mu, accounting for the total stocking. The amount of 60% -70%, of which carp accounted for 30% -35%, carp accounted for 10%, grass carp accounted for 20% 25%. The omnivorous fish stocking rate is controlled at 800-1000 tails/mu, accounting for 30%-40% of the total stocking amount, among which carp accounts for 15%-20%, carp accounts for 10%-15%, and tilapia accounts for 5%.
Third, the specifications of stocking fish species. It is required that the size of the fish be even and the specifications should be large. The squid and squid should preferably be given 0.1-0.25 kilograms of the second-instar fish species. The minimum size should not be less than 12 centimeters. The grass carp should be 0.25-0.5 kilograms of the second-instar species. Less than 15 cm, salmon, mackerel, and tilapia must not be less than 6 cm.
Fourth, the amount of marsh fertilizer. The application of biogas fertilizer should be carried out on a sunny day. Generally, the amount of biogas slurry discharged per acre does not exceed 250-300 kilograms per day, and the amount of biogas residues discharged per acre does not exceed 100-150 kilograms per day. Fertilizer is applied once a day. If the weather is hot, the transparency of water is 20 centimeters (to a white object After being fixed at one end of the bamboo rod, insert it into the water until no white color is visible. If the length of the bamboo rod immersed in water is measured as transparency, then apply it once every other day or 2-3 days. The weekly application should not exceed 3 times. In the application process, the amount and frequency of fertilizer application can also be adjusted according to the change of the transparency of the water color. In general, in April, May, October and November, the water color transparency is not less than 20-25 cm. In June, August, September, the transparency of water color is not less than 10-15 cm.
V. Daily management and precautions
1. The application of biogas fertilizer mainly takes the fish floating head for a long time, and it quickly sinks after sunrise. If it does not sink after sunrise, it should be filled with fresh water or other oxygenation measures.
2. Apply more on sunny days, less on cloudy days, stop on hot days or before thunderstorms. Foggy weather should be applied after the fog.
3, the application of biogas fertilizer should be cast Qing feed.
4. It is strictly forbidden to use biogas fertilizer from biogas digesters that are poisoned but do not produce gas.
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