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国内外苹果树营养诊断指标据美国加州大学H.D、查普曼(Cha-Pman)教授主编的《植物和土壤诊断标准》(1966年初版,1973年再版)一书中介绍“果树营养诊断标准”其中苹果树叶片硼含量在4.8～16.0PPm为缺乏范围,含17～34.0为适当范围。国外资料确认,土壤中有效硼在0.5PPm为硼临界值含量,超过1ppm对某些敏感果树作物将会表现出可见的中毒症状。
According to “Diagnostic Criteria of Plants and Soils” edited by Professor Cha-Pman of the University of California in the United States (the first edition of 1966 and reprinted in 1973), “Nutritional Diagnostic Criteria of Fruit Trees” Among them, the content of boron in leaves of apple tree is in the range of 4.8 ~ 16.0PPm and the range of 17 ~ 34.0 is the appropriate range. Foreign data confirm that available boron in the soil is at a critical boron content of 0.5 ppm and that more than 1 ppm will show visible symptoms of poisoning to some sensitive fruit trees.