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Copper is important as a co-enzyme. It is needed to activate several plant enzymes, including building and converting amino acids to proteins. Since Copper is an immobile nutrient, deficiency symptoms usually occur on new growth. Copper deficient plants will become chlorotic and take on a bleached appearance. New growth may die. 

Manganese is essential to plants but too much is toxic. Manganese functions in chlorophyll development and serves as a catalyst in several enzyme systems in the oxidation-reduction process. Manganese deficiencies are very similar to iron deficiencies and appears in the younger leaves of the plant first. Color may be pale between the veins of broadleaf plants.

Molybdenum helps to transform basic nitrogen into amino acids, which are building blocks for proteins. It also helps legumes to symbiotically fix atmospheric nitrogen. Molybdenum is a catalyst in many oxidation-reduction process within plants.

Zinc is necessary for starch formation and proper root development. It is also essential for seed formation and maturity. The most common symptom of zinc deficiency is interveinal chlorosis on older leaves with shortening of the internodal area. This shortening often results in a short compressed plant with a rosetted appearance.