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联合国粮农组织咨询授课人,[意]格罗范尼·阿鲁教授,于1987年5月21日至6月22日,在山东咨询讲课,并参观了聊城和临沂地区的杨树人工林。回国后,在递交给联合国粮农组织的报告中,他提出了对山东杨树栽培的建议。现将有关部分摘译如下。苗木培育在中国期间,参观了3个苗圃,其中2个是国营的、1个是当地农民自己管理的。苗圃的林相整齐,生长旺盛,管理情况良好。但从新栽植的苗木情况判断,在圃期间,苗木间距太窄。这样子的间距可以培育出细长的,挺直的,大量的苗木
FAO Consultancy Chair, [Italy] Prof. Grothani Aru, from 21 May to 22 June 1987, gave lectures in Shandong and visited poplar plantations in Liaocheng and Linyi. After returning to China, in his report to the UN Food and Agriculture Organization, he proposed a suggestion for poplar cultivation in Shandong Province. Now the relevant part of the extract is as follows. Seedling Cultivation During the visit to China, three nurseries were visited, two of which were state owned and one managed by local farmers themselves. Nursery forest neat, vigorous growth, good management. However, judging from the newly planted seedlings, during the nursery period, the seedling spacing is too narrow. This spacing can be nurtured slender, straight, a large number of seedlings