Microelement Solution

This solution may be added to any medium in order to supply manganese, zinc, boron, potassium, iodine, copper, aluminum, and nickel.

Manganese sulfate (MnSO4 * 7 H2O) 7 mg Zinc sulfate (ZnSO4 * 7 H2O) 1 mg Boric acid (H3BO3) 1 mg Potassium iodide (KI) 0.01 mg Copper sulfate (CuSO4 * 5 H2O) 0.03 mg Aluminum chloride (AlCl3) 0.03 mg Nickel chloride (NiCl2 * 6 H2O) 0.03 mg

Source: Arditti, J. Fundamentals of orchid biology. John Wiley and Sons. 1992.