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2000年在库尔勒市香梨黄化病较重的兰杆乡、英下乡和阿瓦提乡进行定点定株调查分析。结果表明,造成库尔勒香梨黄化病的主要原因,一是土壤和水的pH值偏高,致使土壤中重碳酸根含量偏高,与土壤和叶片中的铁离子结合成盐而沉淀,不能被植株吸收利用,出现正常叶片和黄化叶片中铁离子含量相差甚微的状况;二是由于施肥不合理造成土壤和叶片中硝态氮含量偏高,致使土壤和叶片中的铁离子被固定而使叶片失绿;三是土壤和叶片中的锰、镁离子偏低,镁离子是叶绿素形成的核心,致使随叶片的黄化程度不同叶片中的叶绿素含量发生相应的变化;四是在同一个果园中,黄化树与非黄化树只有个体间的差异,树势强的相对树势弱的植株来说黄化病发生的要轻、要迟,3个香梨园中黄化病的发生与树龄无明显关系。
2000 in Korla pear yellowing disease heavier Lanbang Township, British countryside and Awati Township for fixed-point survey. The results showed that the main causes of yellow pear disease in Korla pear, first, the high pH value of soil and water, resulting in high levels of bicarbonate in the soil, and the soil and leaves of iron ions combined with salt and precipitation, can not Is absorbed by plants, there is little difference between the content of iron ions in normal leaves and yellow leaves; second, due to the unreasonable fertilization, the nitrate and nitrogen content in soil and leaves are high, causing the iron ions in soil and leaves to be fixed So leaves chlorosis; Third, the soil and leaves of manganese, magnesium ions is low, magnesium ions are the core of chlorophyll formation, resulting in different degree of leaf chlorophyll content of chlorophyll content corresponding changes; Fourth in the same Orchard, yellow and non-yellowing trees only individual differences between trees, trees with strong weak relative weaknesses yellowing disease occurred to be light, to be late, the occurrence of yellowing disease in three pear orchard age and no significant relationship.