what is the meaning of Fe-EDTA ? Is therea any long form of EDTA??

Fe-EDTA (Ferric Ethylenediamine tetraacetic acid) is a chelating agent. Iron as you know is an important nutrient for plant growth. Plants cannot use it as such as it is not soluble in nutrient solution, so the Fe-EDTA chelate is used that is formed from the reaction of a divalent or trivalent metallic ion with a ligand, forming a soluble product which can be easily utilised by plants. 

EDTA means Ethylenediamine tetraacetic acid.