I think you are right! Reading from one of my crop production books, it states that iron deficiencies show up as interveinal chlorosis of 'young' leaves. In late stages, the leaf blade may lose nearly all pigment appearing white.
Mobile nutrient deficiencies typically show up on lower 'older' foliage and non-mobile nutrient deficiencies typically show up on new 'young' foliage.
Mobile: N, P, K, Mg
Non-mobile: Ca, S, Fe, Cu, Mn, Zn, and Boron
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