Foliar Application of Humic Acid with Fe Supplement Improved Rice, Soybean, and Lettuce Iron Fortification

Iron (Fe) deficiency in humans, particularly pregnant women and children, is caused by inadequate dietary Fe intake a global nutritional problem. Foliar fertilization cost-effective agronomic approach to increase bioavailability the human diet. We evaluated effects of different formulations (Fe-citrate, Fe-EDTA, FePO4, nano-Fe oxide, humic acid (HA) with without Fe) on growth, yield, accumulation edible parts rice, soybean, lettuce crops. Rice soybean received multiple sprays at growth stages, i.e., tillering, anthesis, grain filling rice as well flowering pod while single foliar spray. In seed increased proportionally number increased; however, yield did not show this relationship. Among treatments, HA+Fe was identified best treatment terms improving overall plant all three found significant positive correlation between shoot/stover content content, but showed an opposite trend, minimal retention shoots/stovers maximal increases contents both crops, suggesting better mobilization efficiency from shoots developing seeds. strongly recommend that HA can be used fertilizer improve status