You might have problem when grow seedlings on seedling bed. Here are some tips for your reference.

The basic principle of temperature control is “three high and three low”, that is, “high in the daytime and low at night;Sunny days are high, cloudy days are low;Before seedling transplanting after high, after seedling transplanting before transplanting before low.

At different reproductive stages of temperature regulation point is: planting to unearthed (germination period), should be given a higher temperature, general like cool vegetables for 20 ~ 30 ℃, 10 ~ 15 ℃ at night, thermophilic vegetables require 25 ~ 35 ℃, 18 ~ 20 ℃ at night.Unearthed appeared to true leaf, moderate growth, appropriate to reduce the temperature, to prevent the young plants generally lower than sprouted 4 ~ 5 ℃;Points to slow shoot appropriately raise the temperature, in order to promote the roots slow seedlings, general like cool vegetables 20 ~ 25 ℃ during the day, night 10 ~ 13 ℃, thermophilic vegetables 25 ~ 30 ℃ during the day, night 15 ~ 18 ℃;One week before transplanting, the temperature should be appropriately lowered, the cold-resistant seedlings should be tempered, and the adaptability of seedlings should be improved.