The biogas fertilizer is the residues left after the biogas has been fully decomposed and fermented, that is, the biogas residue and the biogas slurry are applied to the fish ponds to provide nutrients for the floating plants and animals in the water, increase the production of floating plants and animals in the fish ponds, and enrich the filter-feeding fishes. A feed conversion technique for bait. Marsh fish farming is conducive to improving the ecological environment of fish ponds. Tests have shown that compared with untreated manure, biogas manure has 13.8% oxygen in the water, 15.5% increase in hydrolyzable nitrogen content, 52.9% increase in ammonium salt content, and 11.8% increase in phosphate content, resulting in floating plants and animals. The number increased by 12.1% and the weight increased by 41.3%, which increased the yield of white peony by 36.4% and the yield of flower pod by 9%. Biogas fertilizer fish can increase production by 12% and high quality fish production by 13%. The biogas fertilizer is applied to fish ponds and no longer fermented, which reduces the possibility of dead fish in flooded ponds and at the same time reduces the harm of common pests such as cat head lice, Chinese sturgeon, red peony disease, gill rot and enteritis.
1. Technical points (1) as base fertilizer. Generally in the spring clear pond, after disinfection, apply 150 kilograms of biogas residue per mu or 300 kilograms of biogas slurry, spread evenly. (2) Top dressing. From April to June, 100 kg of biogas residue or 200 kg of biogas slurry will be applied per mu per week. During July to August, 150 kg of biogas slurry will be applied every week. From September to October, 100 kg of biogas residue or 150 kg of biogas slurry will be applied on a weekly basis. . (3) Fertilization time. It is best to apply biogas fertilizer from 8 to 10 o'clock in sunny days; in cloudy and rainy weather, photosynthesis is weak, biological activity is poor, and the amount of fertilizer needed is small, but it is not necessary; windy weather blows the wind; the sultry weather is not applied before the thunderstorm.
2. Precautions (1) The biogas fertilizer fish is suitable for the culture ponds with the main species of the flower white plover, and the proportion of the mixed high-quality fish (bottom fish) does not exceed 40%. (2) If it is a professional farmer, a special automatic biogas digester designed for pigs, marshes and fishes designed by Zhijiang City of Hubei Province can be adopted. (3) When the transparency of the water body is greater than 30 cm, it indicates that the amount of zooplankton in the water is large and the number of phytoplankton is small. The application of biogas fertilizer can rapidly increase the amount of phytoplankton. The method is: Apply biogas slurry once every two days, each time 100 to 150 kilograms, until the transparency returns to 25 to 30 centimeters, into normal fertilization.
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