缺铁黄叶病是河北省果树最常见的生理病害,尤为桃、梨和苹果发病率最高。病树表现为叶片失绿变黄,严重者叶片出现淡褐色死斑、焦枯、甚至坏死、脱落,枝条发育缓慢,花芽难以形成,果实个小、品质低劣,造成减产甚至绝收。 治疗果树缺铁黄叶病的办法就是施用铁肥。多年来果农施用的传统铁肥就是硫酸亚铁,但施用效果一般都不理想。其原因是:河北省土壤多为石灰性土壤,PH值一般在7.5以上,在这种土壤条件下,采用土施方法时,铁离子很快就与土壤中的碳酸盐结合为铁的难溶性化合物,即被土壤矿物所固定而不能被吸收;而采用喷施方法时,有效态的低价铁离子又极易被氧化为难溶性的氧化铁,且操作起来费工费时。科学研究结果证明,施用螯合态 Iron deficiency leaf disease is the most common physiological diseases of fruit trees in Hebei Province, especially peach, pear and apple the highest incidence. The diseased tree showed greenish yellowish leaves. In severe cases, the leaves appeared light brown dead spots, scorched or even necrotic, shedding, the branches developed slowly, the flower buds were hard to form, the fruit was small, the quality was poor, and the yield was reduced or even exceeded. Iron deficiency treatment of fruit tree yellow foliar approach is to use iron fertilizer. The traditional iron fertilizer applied by fruit growers over the years is ferrous sulfate, but the application effect is generally not ideal. The reason for this is that most of the soils in Hebei Province are calcareous soils, and the pH value is generally above 7.5. Under such soil conditions, the iron ions are quickly combined with the carbonate in the soil as iron Soluble compounds, which are fixed by the soil minerals can not be absorbed; and spray method, the effective state of cheap iron ions and easily oxidized into insoluble iron oxide, and the operation time and effort. Scientific research shows that the application of chelating state