果树锌、锰缺乏症,可用0.3％硫酸锌加半量或等量石灰的混合水溶液和0.1％硫酸锰水溶液于生长季节进行叶面喷施,连续喷施2～3次,一般都可以收到良好矫治效果。而缺铁症用0.3％硫酸亚铁的酸性水溶液叶面喷施效果较差。现在比较有效的缺铁矫治措施是:①土壤施用尿素铁代替尿素。在碱性土壤 Fruit tree zinc and manganese deficiency, available 0.3% zinc sulfate plus half or an equal amount of lime mixed aqueous solution and 0.1% manganese sulfate aqueous solution in the growing season for foliar spray, continuous spraying 2 or 3 times, generally can receive good Correction effect. The iron deficiency with 0.3% ferrous sulfate aqueous solution of foliar spray less effective. Now more effective iron deficiency correction measures are: ① soil urea urea instead of urea. In alkaline soil