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以全县群选为基础,初选出120个优株,后经复选、决选,历时24a,最终选择表现最为突出的1个优株,命名为‘德字1号’。2000年将选育出来的‘德字1号’无性系,采用芽苗砧嫁接的方法培育无性系苗木,建立无性系测定林。测定林按8∶2的比例配置参试无性系,经连续4年测定,平均年产油55.614kg、59.798kg、55.227kg和53.498kg,比参试无性系均值分别高34.1%、55.6%、35%、60.4%。
Based on the mass election of the county, 120 excellent strains were selected for the first time, and 1 superior strain was selected as the best one after the selection and selection for 24 years. In 2000, “De Zi No. 1” clones will be bred. Clonal nursery stocks will be nurtured by bud grafting, and climatic test forests will be set up. According to the ratio of 8: 2, the test clones were arranged in clones for 4 years. The average annual output of oil was 55.614kg, 59.798kg, 55.227kg and 53.498kg, respectively, which were 34.1% and 55.6% higher than that of the tested clones respectively. 35%, 60.4%.