1952年,苏联中央林化科学研究所中央试验站在保尔斯克林管区开始进行用漂白粉作为刺激素的采脂试验。1955年,各部门联合委员会对试验林区进行了检查,并确定这种进行了四年试验的采脂方法,对松林的生活能力并没有显著影响,可以推广采用。1957年12月,对这个林区又进行了一次更详细的调查:其林龄为90—95年,地位级为11,树木 In 1952, the Central Experimental Station of the Central Institute of Forest Science and Technology of the Soviet Union began to carry out bleaching experiments using bleaching powder as stimulating hormone in the area of ​​Pinskelling. In 1955, joint commissions of various departments examined the experimental forest areas and determined that the four-year trial of the method of collecting fat had no significant effect on the living ability of the pine forests and could be popularized and adopted. In December 1957, another more detailed survey of the forest area was carried out: its age ranged from 90 to 95 years, its status level was 11. Trees