泡核桃老龄低产树更新复壮技术

Techniques for Renewal Restoration of Old Walnut Trees

泡核桃树龄达到70—80年以后逐渐进入老龄期，树势开始衰弱，大、中枝条逐渐枯死，结果量逐年减少。通过多年研究，摸索出分3年逐渐更新根系、主枝和侧枝，并加强土肥管理及病虫害防治等综合更新复壮技术，第4年树势明显恢复并大量开花结实，获得了可观的经济收益，从而为泡核桃老产区巩固产业持续发展、提高泡核桃产量和质量提供了技术支撑。

Walnut trees would became weak with large ormiddle - sized branches dying and fruit production decreasing gradually when they weremore than seventy to eighty years old. Here a protocol was developed for this kind of trees： root, main shoots and lateral branches should be renewed step by step in three years, at themean time, soil nutrientmanagement and pest and insect control should be strengthened. In this way, trees recovered their vigour and growth in the fourth year and bloom heavily and produced large - quantity fruits, with considerable economic benefits. The techniques will provide technical support for sustainable development of walnut industry in its old production areas through improvement of yield and quality of walnut.