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靖县排牙山林场于1973年春,用44个无性系建立17亩杉木嫁接种子园。1974年有20%左右接株开花,1975年70%以上接株开花结实,1976年绝大部份接株开花结实。1976年结实量比1975年增加3.5倍。1975年起,我们对无性系种子园的生长和结实进行了分析和研究。通过对无性系当代的分析,可及早淘汰性状不良的单株或无性系,缩小后代鉴定的规模。在表型鉴定的基础上进行再选择,可以提高选种、育种的效果。杉木嫁接种子园位于平缓山坡上,坡度10—15度,阳坡。立地条件中等,母岩为砂质岩山地黄壤。
Jing County Pai Yasuyama farm in the spring of 1973, with 44 clones established 17 acres of Chinese fir grafted seed orchard. In 1974 about 20% of the plants then flowered in 1975, more than 70% of the plants flowered, most of the plants in 1976 flowered. In 1976, the increase of 3.5 times more than in 1975. Since 1975, we have analyzed and researched the growth and fruiting of clonal seed orchard. Through the contemporary analysis of clones, we can quickly eliminate single traits or clones with poor traits and reduce the scale of identification of offspring. Based on phenotype identification, re-selection can improve the effect of breeding and breeding. Cedar seed grafting garden is located in the gentle slope, the slope of 10-15 degrees, the sunny slope. Site conditions are medium, the parent rock is sandy rocky yellow soil.