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1964年6月在象牙海岸东南部非洲橡胶研究所的试验站布置了一个大规模的无性系比较试验。试区位于Anguededou森林地,平均年雨量为1900毫米,每年约150个雨日;平均温度25℃,最低18℃,最高32℃;年日照约1500小时。5—6月间刮起大风表明雨季来到。这个地区的土壤为淋洗而极不饱和的第三纪铁铝质沙土。与试的16个无性系来自东南亚南美洲和非洲,经过15年的观
In June 1964, a large-scale comparison test of clones was arranged at the test station of the African Rubber Institute in southeastern Ivory Coast. The test area is located in the forest of Anguededou with an average annual rainfall of 1900 mm and an annual rainfall of about 150 rainy days. The average temperature is 25 ℃, the lowest is 18 ℃ and the highest is 32 ℃. The annual sunshine is about 1500 hours. May-June windy season indicates the arrival of the rainy season. The soil in this area is rinsed and extremely unsaturated Tertiary iron-aluminum sand. With 16 clones tested from South-East Asia South America and Africa, after 15 years of observations