b'Deficiency symptomsThe typical symptom of copper deficiency is the spherical leaf position and a slight yellow discoloration between the veins of the young leaf. At a more advanced stage the leaf margin turns brown. New leaves are smaller and lose their shine and may eventually dry out. The top of the stem dies and the growth of the side shoots is inhibited. The plants have a compact growth and the colour of the flowers is lighter than normal.Excess symptomsAn excess of copper is phytotoxic and oft en occurs in combination with an iron deficiency. An excess of copper impedes iron absorption.MolybdenumThe last essential element is molybdenum. This element cannot be applied in chelated form either. The plant needs the least of these. This is involved in the formation of various essential enzymes. Some prominent enzymes with molybdenum are involved in the conversion of nitrate, sulphate and phosphate and in the energy supply in the plant cell. Molybdenum is diff icult to absorb at a low pH.Deficiency symptomsMolybdenum deficiency first manifests itself in the young leaves. Brown dry spots appear on the leaves. The leaves stay small, curl and the leaf edges can dry out aft erwards.The symptom is very similar to nitrogen deficiency. The pollen is less viable and the fruit setting is poor. By eliminating the molybdenum deficiency, nitrate is converted better and the nitrate deficiencies within the plant are eliminated.Excess symptomsAn excess of molybdenum is rare.131'