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1.合理施肥。施肥是杨树丰产林抚育管理的一项重要技术措施,林地基本郁闭至采伐前应对林木进行施肥,以氮肥为主,其次是磷肥,氮肥与磷肥配合使用。氮肥种类以尿素和碳
1. Rational fertilization. Fertilization is an important technical measure for tending and management of poplar high-yield forest. The woodland should be basically closed to the fertilization of forest trees before harvesting, mainly nitrogenous fertilizer, followed by phosphate fertilizer and nitrogenous fertilizer in combination with phosphate fertilizer. Nitrogen types are urea and carbon