The production of biogas using organic materials such as crop residues and livestock manure is an important measure for building a new socialist countryside and developing a resource-saving and environment-friendly society. Cooking rice with biogas will not only use resources, but also bring convenience to farmers' lives, turn waste into treasure, save energy, and will not cause environmental pollution and form a good material and energy cycle. In addition, biogas production by-products - biogas residue, biogas slurry contains a variety of amino acids and trace elements, is a good feed additive. The use of biogas residues and biogas slurry for livestock and poultry aquaculture can save the cost of breeding and improve the production performance of livestock and poultry aquatic products. The following describes the use of biogas residue, biogas slurry for livestock and poultry aquaculture experience and methods for the majority of farmers.
The use of biogas residue and biogas slurry for fish farming in Anhui and Hexian has achieved good results.
The requirements of the biogas residue biogas slurry: The biogas residue can be directly put into the pool, or it can be mixed into the feed to feed the fish; the biogas slurry does not have to be subjected to solid-liquid separation treatment. Biogas slurry and biogas residue can be applied alternately or at the same time. The biogas slurry has a certain degree of reducibility. After being taken out of the digester for more than 3 hours, the biogas slurry will have a better effect. It should be noted that without adequately fermented biogas residue and biogas slurry, it will consume a lot of oxygen in the pond water after being applied to the fish pond, especially in the hot summer season, it is better to use less or not.
Fish species collocation: Use of biogas residue, biogas slurry fish, there is no specific requirements for fish ponds, but the best water depth is more than 1 meter, water, water and other debris. The method of polyculture of filter-feeding fish and food-eating fish can be used. Generally, about 30% of filter-feeding fish can be stocked, 40-50% of omnivorous fish, and 20-30% of herbivorous fish. The specific types include cod, eel and eel. , squid, grass carp, squid, herring, etc. The amount of stocking can be determined based on the supply of biogas residues and biogas slurry. High-yielding culture ponds can also be fed with commodity feeds to increase the number of feeds. It is a good way to launch fish species with different specifications and implement round catch and rotation.
Management points: The application of biogas residue and biogas slurry should be determined according to the specific conditions of the fish pond. Generally, the amount of biogas slurry per acre of water cannot exceed 300 kg at a time, and the amount of biogas residue should not exceed 150 kg. Not more than 3 applications per week. The application should be done on a sunny day, usually once every other day. Using Quanchiposa. Biogas residues can also be applied at different points. Adhere to the principle of fixed points. The specific control method can be determined according to the season and the water quality of the pond. Generally, in April, May, October, and November, the transparency of the control pool should be no less than 25 cm, and the transparency of the controlled pool should not be less than 15 cm from June to September. If the transparency of water is lower than the above standard, biogas residue and biogas slurry cannot be applied. In hot summer months, care should be taken to find that the floating head of the fish should be stopped; hot weather and thunderstorms should be avoided. The application of biogas slurry and biogas residue should not be excessive, and should adhere to the principle of a few times. If there is an oxygen deficiency phenomenon such as fish floating head, it is necessary to take oxygenation measures in time, and it is also possible to add new water as soon as possible; if fish diseases are found, it is necessary to find out the reasons and prescribe the right medicine.
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