Detailed explanation of the pig-biogas-fruit ecological model technology: suitable for fruit trees, fish, and vegetables

I. Technical introduction
The "pig-biogas-fruit (fish, vegetable)" ecological model technology takes farming households as the main production entity; by developing livestock and poultry raising, manure is fed directly into a biogas digester for anaerobic fermentation, and the fermentation residue is used to grow fruit (or raise fish, or grow vegetables), thereby increasing yield and quality and achieving the goal of pollution-free production; using biogas slurry to feed pigs can improve feed utilization, shorten the pig fattening cycle, and reduce costs. This model is simple to operate and requires little investment; the agricultural products produced can meet the requirements for pollution-free agricultural products, and the comprehensive utilization of agricultural waste can reduce pollution and promote the sustainable development of agriculture. Model construction content: build one "three-in-one" biogas digester, raise one pen of pigs, and plant one orchard of fruit (or raise one pond of fish, or plant one plot of vegetables).
Technical key points and operation methods:
1. Biogas digester: Plan the biogas digester well, build it connected to the pig pen and toilet so that manure flows into the digester by itself; it is best to build the biogas digester beneath the pig pen. The biogas digester shall be built and pressure-tested for acceptance in accordance with national standards.
2. Construction of pig pen and orchard (fish pond, vegetable garden): Build in accordance with relevant industry standards.
II. Operating procedures
1. "Pig-biogas-fruit (vegetable)" ecological model: Root fertilization for fruit trees and vegetables is the same as with conventional farmyard manure, but the amount can be larger and can be applied closer to the roots to improve fertilizer utilization; for foliar fertilization of fruit trees, after fruit harvest, spray biogas slurry three times in a row, once every 5-7 days, and at the same time apply additional biogas fertilizer at the roots for a better effect.
2. "Pig-biogas-fish" ecological model: Apply fertilizer in the conventional amount. The amount of biogas fertilizer applied should be controlled according to the transparency of the water color; in May, June, September, and October, the transparency should be no less than 20 cm, and in the high-temperature season of July and August, no less than 10 cm; biogas fertilizer should be extracted when fermentation and gas production are normal; for a 6-8 cubic meter biogas digester, 600-800 kg of biogas slurry and 250 kg of biogas residue can be extracted every 5-7 days; do not extract excessively, so as not to affect the use of biogas.
III. Precautions
1. The biogas digester should be one that is fermenting and producing gas normally.
2. Do not extract too much material at one time, so as not to affect the use of the biogas digester and carry out raw material.
IV. Benefits and effects
1. The "pig-biogas-fruit" ecological model can increase yield by about 9% and can increase sugar content; foliar fertilization can prevent freezing damage; the "pig-biogas-vegetable" ecological model can improve the quality of vegetables and increase yield; in the "pig-biogas-fish" ecological model, the survival rate of fry can be increased by more than 10% compared with traditional methods, and the yield of adult fish can increase by up to 27%.
2. The "pig-biogas-fruit (fish, vegetable)" ecological model can effectively reduce the use of pesticides and chemical fertilizers and achieve pollution-free agricultural production.