食盐具有影响土性和促进离子交换的作用。我省农村中,老农早有沙沟田盐水染稻秧,盐水催茄秧,施盐防小麦倒伏等经验,叙永县林区有用巴埋杉树根下以作肥料。据此,为研究促进杉木幼期生长的措施,结合我省杉木林区的土壤特点,于1971年起连续三年进行了盐水浸根试验,1973年起进行了施盐试验。 Salt has the effect of affecting soil properties and promoting ion exchange. In the rural areas of our province, the peasants had long experience of salt-stained brown rice in Shaguda County, salt watery tomato seedlings and salt-tolerant wheat lodging. Therefore, in order to study the measures to promote the growth of Chinese fir in early stage, combined with the soil characteristics of Cunninghamia lanceolata forest in our province, salt water immersion test was conducted for three years in succession from 1971, and the salt application experiment was carried out in 1973.