布西(W.D.Bush)在美国农业部的出版物“美洲软木”(Balsa)上,以“最轻的商品材美洲软木”为题,做了下面的报告:美洲软木树生长极快,特别是在栽植后的几年当中,其生长速度更快。例如美洲软木的主要生产国家南美的厄瓜多尔,栽植后经过6个月,直径就达到3.8公分,树高达到3—3.7公尺;经过1年,直径 WDBush wrote the following report entitled “Lightest Commercial Cork” in the U.S. Department of Agriculture’s publication “Balsa.” American softwood tree growth pole It grows faster, especially in the years after planting. For example, Ecuador, the main producing country for cork in South America, has a diameter of 3.8 cm and a tree height of 3-3.7 m after 6 months of planting. After one year, the diameter