碱性砂质土壤地建苹果园应注意防治苹果小叶病苹果小叶病发生的主要原因是由于缺锌而引起的生理性病害。砂质土壤中的锌易被淋失，致使土壤中锌的绝对含量降低；碱性或偏碱性土壤中锌易被固定，使土壤中有效锌含量相对减少。解决上述矛盾可采取如下措施。１重视果园土壤管... Alkaline sandy soil to build apple orchards should pay attention to prevention and treatment of apple leaflet Apple leaflet disease is the main reason for physiological deficiency caused by zinc deficiency. Zinc in sandy soils is easily leached, resulting in a decrease in the absolute amount of zinc in the soil. Alkaline or alkaline soils are easily immobilized and the available zinc content in the soil is relatively reduced. To resolve these contradictions can take the following measures. 1 emphasis on orchard soil tube ...