梨树缺硼的症状与防治武之新（河北省沧州市农林科学院０６１００１）梨是我国北部地区的大宗水果之一。在华北东部低平原上的“天津鸭梨”、河北鸭梨”是这个地区的特产，也是我国出口创汇的名优产品。梨树为乔木，长期在一个局部的土壤环境内生长发育、开花结果，若管理... Pear boron deficiency symptoms and prevention Wu Zhixin (Cangzhou City, Hebei Academy of Agriculture and Forestry 061001) Pear is one of the bulk of the fruits of northern China. The “Tianjin Yali Pear” and “Hebei Yali Pear” in the low plain in the eastern part of North China are the specialties of this region and are also famous products for exporting foreign exchange in our country. The pear tree is a long-term growth and development in a local soil environment, If management ...