Foliar nutrition cannot replace or eliminate the natural way of nutrient uptake by plant roots. In general, foliar application of mineral elements is not so effective as to cover the complete nutritional requirements needed by plants. It mainly results from restrictions in applying increased doses of mineral nutrients or it insufficient translocation from leaves to roots. Nevertheless, depending on plant species, a significant portion of plant requirements for mineral nutrients (mainly microelements) can be covered by foliar nutrition. Because of the polar characteristics of the leaf cuticle and pectin layers (negative charge), these layers contribute to a much higher efficient translocation of apolar and cation molecules rather than anions. For that reason, a low efficiency is observed for foliar nutrition with mineral nutrients in anion forms (NO3, P, S, B, Mo), and a high translocation (leaf absorption) for cations (NH4, K, Ca, Mg, Fe, Mn, Cu, Zn), - Millet