一,澳大利亚的一个苗圃用聚乙烯作苗圃幼苗的复盖物试验成功。试验目的在于防止杂草生长、保持土壤水分以及刺激幼苗生长,结果很好。其作法是用12吋宽的黑色聚乙烯放置在发芽不久的白蜡树幼苗行间,每条聚乙烯之间留给幼苗1吋空隙。两个月以后,杂草没有会么生长,水分得到保持,幼苗比同期种植而未加复盖的更为健壮。此外,对松树和桉树的苗圃也进行了试验,估计原订于十月移植的幼桉现在于四月就可移植。 First, a nursery in Australia with polyethylene seedlings for the nursery cover the successful trial. The purpose of the experiment was to prevent weeds from growing, to maintain soil moisture, and to stimulate seedling growth, with good results. The practice is to use a 12-inch wide black polyethylene placed in the row of white waxy seedlings near the germination, leaving a 1-inch seedling gap between each polyethylene. After two months, the weeds did not grow, the water was maintained, and the seedlings harvested more than the same period. In addition, nurseries of pine and eucalyptus were also tested and it is estimated that the eucalyptus replanted originally in October is now being transplanted in April.