What are the benefits of earthworms to the soil?

1. Improve soil structure: Earthworm activity can improve soil structure and enhance soil water retention and air permeability. 2. Decomposition of organic matter: Earthworms can decompose organic matter in soil and improve the recycling rate of nutrients in soil. 3. Improve soil nutrients: Earthworms can significantly promote the mineralization of nitrogen in soil and increase the content of available nitrogen in soil. 4. Promote plant growth: Earthworm activity can promote root growth, plant development and crop yield. 1. Eisenia foetida: Eisenia foetida, commonly known as red earthworm, is also the most common cultivated earthworm. Its individual is relatively small, with a body length of about 60- 160mm, a body width of about 3-5mm, and a body storage of 80- 1 10. Its annulus is generally orange-red or chestnut-red. 2. Pheretima annulata: Pheretima annulata, commonly known as green earthworm, green earthworm and earthworm annulata, is relatively large, with a body length of about 90-250 mm and a body width of about 5- 10 mm, with a bluish yellow, grayish green or grayish blue back and a light gray midline. 3. Lumbricus ginseng: Lumbricus ginseng, commonly known as earthworm, is also the most common earthworm in China. Its individual is relatively large, with a body length of about1/kloc-0 ~ 380mm and a body width of about 5~ 12mm. Its back is purple-gray, slightly shallow, and its bristles are white. 4. Gongpheasant: Gongpheasant, commonly known as black pheasant, is also the most common earthworm in South China. Its body length is about 130~ 150mm, its body width is about 5~7mm, and its body storage is102 ~10. Its back is grass green and its midline is dark blue.