美国农业部林业局1979～1980年期间先后进行了7次试验,在浓度为53%的硫酸膏中掺入各种添加剂涂在割皮伤口上,用来采集21～23年生湿地松和60年生长叶松松脂。割皮后2～4周收脂称重,发现CEPA(2-氯乙基磷酸)能明显提高松脂得率。用浓度为 The Department of Agriculture’s Department of Forestry from 1979 to 1980 has carried out seven trials in the concentration of 53% of the sulfate paste mixed with various additives coated on the cut skin wounds, used to collect 21 to 23 years old slash pine and 60 years Slash pine resin. Cut the skin 2 to 4 weeks after receiving fat weighing and found that CEPA (2-chloroethyl phosphate) can significantly improve the yield of turpentine. With a concentration of