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受河北省科委的委托,邯郸地区科委于1986年11月25日邀请有关科研单位和大专院校的专家、教授与科技人员在邯郸市对“苹果树小叶病防治技术”进行了鉴定。由缺锌引起的苹果树小叶病,使苹果树生长发育严重受阻,影响果品的产量和质量。据调查,在邯郸果产区苹果产量一般损失20～50％。国外虽曾做过锌肥试验,但多于萌动前喷施高浓度的硫酸锌,
Commissioned by the Hebei Provincial Science and Technology Commission, Handan Prefecture Science and Technology Commission on November 25, 1986 invited experts and professors and scientific and technological personnel of relevant scientific research units and tertiary institutions in Handan City on the “apple tree leaf disease prevention and control technology” were identified. Apple leaflet disease caused by zinc deficiency severely hindered the growth and development of apple trees and affected the yield and quality of fruit products. According to the survey, Apple production in Handan fruit producing areas generally loss of 20 to 50%. Although zinc fertilizer tests have been done abroad, but more than the sprout before spraying high concentrations of zinc sulfate,