Earthworms are omnivorous animals with a wide range of feed sources, including distiller's grains, peels, vegetable leaves and domestic garbage. Pig manure can be used to raise earthworms. Fresh pig manure is collected and piled up, and each pile is spread out and dried to 70%. Then add 20% soil, 3% wheat bran and rice bran, seal the pile with plastic film, and the pig manure will be fermented in about 7 days. Then spread the fermented pig manure in the pit, cover it with grass or grass curtain and keep it moist for about 20 days.

Technology of raising maggots with pig manure: pile fresh pig manure into semicircle or strip with a height of 20-30cm and a width of 30-40cm, and then put it into aseptic engineering flies, which will lay eggs on the pig manure. Lighting and heating facilities: install incandescent lamp, 3 watts per square meter. If possible, install heating equipment (geothermal wires, solar energy, coal stoves, small boilers, etc.). ) according to the actual situation to build a constant temperature ecological greenhouse.