Iron

A significant micronutrient, which is represented by the chemical symbol Fe. Iron is required for the formation of chlorophyll and is a component part of many enzymes involved with plant growth and development. It is involved in the process of photosynthesis (both Photosystems I and II), being important for structural viability of thylakoid membranes.

Iron deficiency results in interveinal chlorosis, initial yellowing of the leaves, and reduced photosynthetic activity, and this can also result in photooxidative damage (due to excessive light levels penetrating into the leaves) in deficient leaves. Iron deficiency can be a problem on chalky soils, producing lime-induced chlorosis, as well as soils with high concentrations of phosphorus reduce root uptake of iron.

It is usually supplied as ferrous sulphate and temporarily improves grass greenness, without producing a flush of growth. It also acidifies the soil surface.