EDDHA-Fe is a new plant nutritional supplement, with features of high solubility, high efficiency, quick effect, and wide suitability, etc. It can be rapidly absorbed by crop from PH3 to PH10; EDDHA-Fe has significant effects on Yellow-leaf Disease of fruiter, vegetable and crop, caused by iron deficiency; it can promote the chlorophyll synthesis of crop, enhance the photosynthesis and increase the yield effectively