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用嫁接方法建立杉木种子园,首先遇到的问题是接株严重偏冠,不能形成完整直立冠形。据靖县排牙山林场初步调查,嫁接10年后,偏冠接株的冠长只是直立冠形接株的1/3。偏冠接株不仅外形难看,结实层薄,结果量少,而且易遭风折雪压等危害。为了解决杉木嫁接偏冠,提高杉木嫁接种子园的产量,我们遵照毛主席“一切经过试验”的教导,通过多年试验,初获效果,杉木嫁接正冠率由原来的20％左右提高到70％以上,最高达91％,接株的生长速度加快了80—120％,最快的年高生长
With the grafting method to establish Chinese fir seed orchard, the first problem encountered is that the strain is severely crowned and can not form a complete upright crown. According to preliminary investigation of Yasuyama Forest Farm in Jingxian County, after 10 years of grafting, the crown length of the partial crowns was only 1/3 of that of the erect crown type ones. Partial Crown strain is not only ugly appearance, thin layer, the result is less, but also vulnerable to wind and other hazards. In order to solve the crown of Chinese fir grafted, and improve the yield of Chinese fir grafted seed orchard, we follow Chairman Mao’s “all tested” teaching, through years of testing, the initial effect, fir grafting positive crown rate increased from about 20% to 70% Above, up to 91%, then the growth rate of the strain accelerated 80-120%, the fastest annual growth