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EF植物生长调节剂是从桉树中提取出来的一种黄酮类物质。在葡萄、苹果试验的基础上,1987年5月我们将其应用在盛花期山楂树上,对提高座
EF Plant Growth Regulator is a flavonoid extracted from eucalyptus. Based on the grape and apple experiments, we applied it to the hawthorn trees in full flowering in May 1987,