• Rolled oats 20.00 g
• Agar 12.00 g
• Trace elements solution (see below) 1.00 ml
• Distilled water 1 L

Rolled oats are boiled for 20 min and filtered, then add agar. Make up to 1000 ml. Then trace elements are added.

Trace elements solution:

• FeSO₄.7H₂O 0.10 g
• MnCl₂.4H₂O 0.10 g
• ZnSO₄.7H₂O 0.10 g
• Distilled water 100.00 ml