棉田盖草的主要功用,是减少棉田土壤水分的蒸发,使棉田保水良好,减轻旱害,像江西彭泽的气候,每到伏天,常感雨水不足、而这时正当棉花开花结铃最需水分时节,在棉田施行盖草,对棉花生育甚为有利。另一方面,由于棉田土壤蒸发减少后,下层盐质,不致随水上升,像浙江和北沿海一带新垦地 Covering the main function of cotton grass is to reduce the evaporation of soil moisture in cotton fields, so that good cotton water conservation and drought mitigation, such as the climate of Pengze in Jiangxi Province, every volt day, often feel inadequate rainfall, and then when the proper cotton boll bell Moisture season, the implementation of covered in the cotton grass, cotton is very favorable for childbearing. On the other hand, due to the reduction of soil evaporation in the cotton fields, the salt in the lower layer will not rise with the rise of water. Like the newly reclaimed land in the coastal areas of Zhejiang and North China