Thanks for query

According to NCERT it is Ferric but when you see higher level textbooks they have both Ferric and Ferrous so it depends.Plant mostly absorb iron from the rhizosphere .Iron availability is determined by soil Redox potential & It's pH.Although most of the iron on the earth crust is in the form of Fe3+, the Fe2+ form is physiologically more suitable for plants .Though Fe2+ form is relatively soluble, but is readily oxidized to Fe3+ at the junction of the protoxylem and the metaxylem, chelated by citrate, and then transported in the metaxylem to the plant top.