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油松是西北和我省黄土高原造林的主要树种。近几年来,桥山林业局建庄、店头林场和宜川县英旺林场进行山地育苗获得成功。建庄林场培育的2年生苗平均高26.2厘米,根径0.55厘米,每亩产苗量17万株。英旺林场培育的1年生苗一般高8～14厘米,根径0.17～0.22厘米,亩产18～22万株;2年生苗一般高17～19厘米,根径0.35厘米,亩产14～18万株。山地育苗具有就地育苗,就地造林,不与农田争地,省工、省时、省运输,苗木生长健
Pinus tabulaeformis is the main tree species afforestation in Northwest and Loess Plateau of our province. In recent years, Qiaoshan Forestry Bureau built Zhuangtou, Shentou Forest Farm and Yichuan County, British Hill farm nursery success. The average length of 2-year-old seedlings nurtured in Jianzhuang Forest Farm was 26.2 cm and the root diameter was 0.55 cm. The output of seedlings per mu was 170,000. The annual seedlings nurtured in the British Forest Farm are generally 8-14 cm in height and have a root diameter of 0.17-0.22 cm and a yield of 182-220,000 mu. The 2-year-old seedlings are generally 17-19 cm tall with a root diameter of 0.35 cm and a yield of 14-18 Million. Mountain nursery with nursery in situ, afforestation in situ, not compete with the farmland, labor, time, provincial transport, seedling growth and development