Iron (Fe) – it is a chloroplast building material. Iron is important for development of new plant parts and roots. Lack of iron can cause the veins of young leaves to lighten or turn yellow. High pH, ​poor root growth, and low soil temperatures can severely impair iron absorption. Iron (Fe) – one of the most important trace elements, on which the uptake of many other nutrients directly depends. In absence of iron, plants find it difficult to absorb other necessary nutrients, although their content in the soil is relatively sufficient. Iron is actively involved in plant metabolic processes, they are in enzymes, it activates respiration, affects the formation of chlorophyll, auxin biosynthesis.