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通过对伏尔加河中下游及南乌克兰和摩尔达维亚果园的调查,证实了在土壤有效锌贮量低的情况下,游离状态磷酸盐含量增高是导致小叶病的主要原因之一。关于磷对发生苹果小叶病的作用,国内外的试验很少。我们的研究主要是用施高量磷和锌的方法诱发和消除小叶病。我们在查波罗什省《伽敏伽》农场1974年定植的试验园进行了观察。试验园为普通中等壤质碳酸盐黑钙土,底层为古代冲积碳酸盐沉积物。水浸液0～100厘米pH为8.4,100～
A survey of orchards in the middle and lower reaches of the Volga River and in southern Ukraine and Moldavia confirmed that increased levels of phosphate in the free state were one of the major causes of lobular disease in the presence of low available zinc reserves in the soil. Phosphorus on the occurrence of the role of apple leaf disease, few trials at home and abroad. Our research is mainly to induce and eliminate leaflet disease by applying high levels of phosphorus and zinc. We looked at a pilot garden planted in 1974 in the “Jamunjar” farm in Zaporizhzhya. The test center is medium to medium loamy carbonate calcareous soil, with the bottom being ancient alluvial carbonate sediments. Water extract 0 to 100 cm pH 8.4,100 ~