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前言用生物激素和化学药物刺激松树泌脂是提高树木产脂量的重要措施。目前,世界上主要生产松脂的国家,已实行刺激法采脂,(在采脂时,用刺激剂处理割沟),使劳动生产率有了很大的提高。1950年美国就用50%硫酸作采脂的刺激剂,1966年以后开始采用硫酸软膏。现用的软膏是由60%硫酸、硅粉、非离子润湿剂或乳化剂配成,因色黑,叫做黑膏。苏联亦采用过硫酸软膏,常用的有卡普隆软膏和高岭土软膏。墨西哥、葡萄牙、西班牙等国也都用
Preface With bio-hormones and chemical drugs to stimulate the secretion of pine is an important measure to increase the amount of fat produced by trees. At present, the countries that produce mainly rosin in the world have adopted the stimulation method and fat extraction (when cutting fat, stimulants are used to cut the furrows), which has led to a great improvement in labor productivity. In 1950, the United States used 50% sulfuric acid as a fat stimulant and started using sulfuric acid ointment after 1966. The active ointment is made up of 60% sulfuric acid, silicon powder, non-ionic wetting agent or emulsifier, because of dark color, called black paste. The Soviet Union also used peroxy sulphate ointment, commonly used Kapron ointment and kaolin ointment. Mexico, Portugal, Spain and other countries are also used