Generally speaking, the active temperature of earthworm is 5-30℃, and it goes into dormancy at 0-5℃ and dies below 0℃. The optimum temperature is about 20-27℃, which is also the optimum temperature of earthworm cocoon eggs. Stop growing above 32℃ and die above 40℃.

Therefore, in summer and autumn, it is necessary to build a shade shed to cool down (mulberry fields have natural shade conditions, but mulberry trees still need temporary shade after summer cutting and before germination and growth are sealed), and in winter, it is necessary to heat the shed with fire (the existing equipment in the silkworm house can be used) or cover the mulberry fields with wheat straw to keep warm and raise the temperature, which is beneficial to the normal growth and reproduction of earthworms.

Extended data:

Growing habits:

Earthworms breathe through their skin, so their bodies must be kept moist. The water in earthworm accounts for more than 75% of its weight. Preventing the loss of specific water is the key to the survival of earthworms, so the humidity of feed should be kept at about 70%.

Earthworms grow well in the range of pH 6-8 and produce the most cocoons. Earthworms breathe by oxygen diffused from the atmosphere into the soil. The better soil ventilation, the more vigorous its metabolism, not only more cocoons, but also shorter maturity.

Lack of food or poor quality will make maggots compete for food, which will lead to the decline of fertility, the spread of pests and diseases, the increase of mortality, and some earthworms escape or grow slowly.