Copper is immobile in soil. Solubility and plant availability of Cu is highly dependent on soil pH.  Copper solubility increases approximately 100 fold for each unit decrease in soil pH. Copper deficiencies usually occur in irregular patches within fields. High levels of soil P can also depress Cu absorption by plant roots creating the Cu deficiency. Avoid blending Cu sulphate fertilizer with other fertilizers. The blend readily absorbs moisture.

Copper is involved in several enzyme systems, cell wall formation, electron transport and oxidation reactions.  Copper is not readily transferred from older to younger leaves.