凌源县十年九旱,为解决高山、远山、石质山的造林问题,刘杖子公社干沟子大队从一九七六年开始,连续两年进行油松泥杯(营养杯)育苗,造林试验,造林成活率达93％,七六年试栽的油松,平均高生长为1.16米(最高1.30米),地径3厘米。近四年全县用泥杯造油松五千多亩,成活率达85％。 In order to solve the afforestation problem of high mountains, distant mountains and stony mountains, Liu Zizi commune Gangouzi Brigade started breeding in 1974 for two years in succession. Afforestation test afforestation survival rate of 93%, seventy-six years planted Pinus tabulaeformis, the average high growth of 1.16 meters (up to 1.30 meters), diameter of 3 cm. In the past four years, the county has made more than 5,000 mu of muddy pine with a mud rate of 85%.