NutriHydro Iron Chelate is for rapid intervention in plant nutrient needs. It is used to treat plants with iron and other trace element deficiency. In liquid chelate form, plants are able to uptake the nutrient at a faster rate allowing it to be classified as rapid intervention.
There are farmers using NutriHydro Iron Chelate to accompany NutriHydro Lettuce formula. They do so because using such leads to bigger stems and bigger stems lead to huge leaves.