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美国佐治亚国际造纸公司的棕渡种子园和八橡树种子园,分别建于1956年和1958年,面积各自为4英亩(1英亩=6.07亩)和60.5英亩。该公司在经营管理方面,采取了下列几项技术措施: (1)深耕底土1967年纵耕一次,1971年横耕一次。(2)施肥从1968年起开始施肥,每年每英亩施1吨石灰和300磅10—10—10(一种肥料代号)。(3)修枝从1967年起修去较低的枝条。(4)防虫每年用液剂喷射5—6次。(5)去劣通过子代鉴定和种子检验选
Georgia International Pulp and Paper Co., Ltd.’s Brown Fern Seed Park and Eight Oak Tree Seed Garden were built in 1956 and 1958, respectively, with an area of 4 acres (1 acre = 6.07 mu) and 60.5 acres. The company in business management, has taken the following technical measures: (1) Deep-soil subsoil Once in 1967 once cultivated, once again in 1971 tillage. (2) Fertilization Fertilization begins in 1968 with 1 ton of lime and 300 lb of 10-10-10 per acre per year (a type of fertilizer designation). (3) Pruning fixes to lower branches since 1967. (4) pest control every year with liquid injection 5-6 times. (5) Defeat through offspring identification and seed testing selection