【摘要】 <正> 本世纪五十年代末以来,由于自动化仪器分析技术运用到果树营养诊断,使果树生产可以根据树体和土壤各种养分的盈亏状况进行合理施肥,而且在果树营养生理上也较前有较深入的了解,各种营养元素间的生理平衡关系,更日益为人们所重视。现代果树更多还原

【Abstract】 Leaf analysis from orchards of Mt. Liangshan region showed that the incidence and severity of boron deficiency tend to be negatively correlated with leaf boron contents. Orchards with severe symptoms of boron deficiency are not only low in leaf boron but also low in leaf nitrogen, phosporus, calcium, magnesium and zinc. The degree of deficiency of these elements was significantly correlated with boron deficiency. Spray of 0.4% borax solution at full bloom only increased leaf boron content, while soil application of boron tends to increase leaf boron, iron, nitrogen and calcium, and decrease leaf magnesium and zinc. It is supposed that part of the nutritionalproblems in nitrogen and calcium of apple trees in Mt. Liangshan yellow earth region were due to lack of boron which decreased the uptake of these two nutrients. But, the lack of zinc might be caused mainly by the low content of available zinc in the soil.更多还原