Calcium-magnesium balance: Ca:Mg ratio 3:1 to 5:1 optimal — calcium deficiency shows brown spots, magnesium deficiency causes interveinal chlorosis.
Ca:Mg ratio 3:1 to 5:1 optimal. Calcium deficiency: brown spots, necrotic areas, weak cell walls. Magnesium deficiency: chlorosis between leaf veins, starting on older leaves. Treatment: CalMag supplement, pH 6.0-6.5 for optimum uptake. Avoid lockout due to too high EC or incorrect pH.
A calcium deficiency is indicated by brown spots on the leaves, especially at the tips and edges.
A magnesium deficiency manifests as chlorosis that appears between the leaf veins, while the veins themselves remain green.
The optimal calcium-to-magnesium ratio is between 3:1 and 5:1; this can be adjusted through targeted fertilization.