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成龄低产杨梅园在我省杨梅产区普遍存在。主要表现为树冠高大、树势衰弱、外围枝过密、内膛空虚、整体丰产性能差,大小年结果严重。据我们对余姚市低产园成因的调查,主要是立地条件差,经营管理粗放,缺乏施肥与修剪及病虫害危害严重。我们于1993～1996年在余姚对低塘、丈亭、三七市三个乡镇进行低产园改造技术试验,取得了较好的效果。对于低产园主要采取四个方面措施进行改造,现介绍如下:
Low-yielding old bayberry bayberry production areas in our province widespread. Mainly manifested as tall tree, shrub weakness, the peripheral branches are dense, hollow inner chamber, the overall poor yield performance, the size of the annual results. According to our investigation of the causes of low-yielding gardens in Yuyao City, the main reasons are poor site conditions, extensive management, lack of fertilizer and pruning and serious harm to pests and diseases. In 1993 and 1996, Yuyao experimented on the technological transformation of low-yielding gardens in three villages and towns, namely Low Tong, Zhangting and Sanqi, and achieved good results. The low-yielding garden mainly adopts the measures of four aspects to carry on the transformation, the present introduction is as follows: