In the coming winter, mushrooms farmers may find that mushrooms grow tardy. Some experts point out that it is all on account of dry weather, which makes it hard for them to absorb sufficient water vapor, thus leads to tardy growth trend, low output and poor benefit. According to know, the required humidity on mushroom growing is over 80%, while the usual humidity is universally under 30%, which may affect the growth. For this kind of phenomenon, farmers could adopt humidifier and other equipment to effectively rise relative air humidity.