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我们在长期的生产实践中发现,在果园里普遍存在着南墙根里侧的树抽条、再生和死亡的现象,明显比其他地方严重。我们认为造成这种现象的主要原因,是
We have found in long-term production practices that the prevalence of tree-drawing, regeneration and death in the orchards of southern walls is significantly greater than in other places. We think the main reason for this phenomenon is