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苹果缺铁黄叶病,是苹果的重要生理病害。据报导,全世界的发生面积,约占苹果栽培总面积的10%。我国北方苹果的主栽区,如渤海湾、华北平原、西北黄土高原,以及黄河故道等地区也有发生。仅据山东省8个地市的不完全统计,发生面积就达7万余亩,影响树势发育,造成产量、品质下降,死株率约占10%左右。烟台市果树研究所于1981～1983年,经过3年研究,提出了应用黄腐酸二胺铁和尿素铁叶面喷施的新技术。为了把这项研究成果尽快在生产中推广应用,进一步改进、提
Apple yellow iron deficiency disease is an important physiological disease of apple. It is reported that the occurrence of the world area, accounting for about 10% of the total area of apple cultivation. Apple plantations in northern China, such as the Bohai Bay, North China Plain, Northwest Loess Plateau, and the Yellow River and other areas also occurred. According to the incomplete statistics of 8 prefectures and cities in Shandong Province alone, the area has reached more than 70,000 mu, affecting the development of tree vigor, resulting in the decrease of yield and quality. The rate of dead strains accounts for about 10%. Yantai Fruit Tree Research Institute in 1981 to 1983, after three years of research, put forward the application of yellow iron humate and urea iron foliar spraying new technology. In order to popularize and apply the research results in production as soon as possible, further improvement and mention are made