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按立地、林分、经济等因素综合考虑，对永嘉县板栗低产状况确定3种改造方法，即改劣换优、肥培管理、病虫防治。
According to site, forest, economy and other factors, three transformation methods of low yield of chestnut in Yongjia County were determined, that is, change and exchange, fertilization and pest management.