四川省是中国三大柑桔产区之一.柑桔主要分布在盆地海拔700m以下的丘陵、河流两岸的低山、河滩和平地.柑桔园土壤主要为钙质壤土,因此柑桔缺铁黄化现象比较严重,表现为叶片黄化、花果脱落、果子小、品质差、产量低,严重时不挂果,甚至死亡.1994年由四川省农科院土肥所引进高科技产品EDDHA螯合铁盐,进行矫治柑桔缺铁黄叶病的试验,取得显著效果,现总结如下. Sichuan Province is one of the three major citrus producing areas in China.Main citrus mainly distributes in the hills below 700m above sea level and is lowland, floodplain and flatland on both sides of river.The soil of citrus orchard is mainly calcareous soil, Yellowing phenomenon is more serious, the performance of leaf yellowing, flower and fruit fall off, fruit is small, poor quality, low yield, serious hang fruit, and even death.In 1994 by the Sichuan Provincial Academy of Agricultural Sciences introduced high-tech products EDDHA chelate Iron salts, oranges yellowing treatment of iron deficiency test, and achieved remarkable results, are summarized as follows.