人们越来越认识到,“广种薄收”的林木栽培远不如集约栽培有效和有利,因此,积极营造丰产林,给丰产林施化肥已是国外一项普遍采用的重要措施。目前,一般供农作物所用的氮磷钾速效肥不完全适合多年生木本植物对肥料的需要,因而造成了肥料和劳动力的浪费,所以,发展适合林木所需的化肥很有必要。日本 People are more and more aware of the fact that the cultivation of broad-leaved trees is far less effective and profitable than intensive cultivation. Therefore, it is an internationally accepted and important measure to actively cultivate high-yield forests and apply fertilizers to high-yield forests. Currently, NPK fertilizers generally used for crops are not completely suitable for fertilizer needs of perennial woody plants, resulting in a waste of fertilizers and labor. Therefore, it is necessary to develop fertilizers suitable for forest trees. Japan