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Old leaves turn yellowish/ red
Nitrogen deficiency
Old leaves turn yellowish/ red
Leaf loss and small dead areas
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Phosphate deficiency
Black/ brown leaves, plants die
Excess phosphates
Yellow spots on old leaves and yellowish margins on younger leaves
Potassium deficiency
Yellowish margins on young leaves with deformations
Calcium deficiency
Yellow spots on old leaves while veins stay green
Magnesium deficiency
Young leaves turn yellow
Sulfur deficiency
Yellowing leaves starting from the tip then become white
Iron deficiency
Yellow spots between the veins, margins and tips
Zinc deficiency
Plant stays small slow or now growth.
CO2 deficiency
This is a short simple guide.
Nitrogen deficiency
Old leaves turn yellowish/ red
Leaf loss and small dead areas
=========
Phosphate deficiency
Black/ brown leaves, plants die
Excess phosphates
Yellow spots on old leaves and yellowish margins on younger leaves
Potassium deficiency
Yellowish margins on young leaves with deformations
Calcium deficiency
Yellow spots on old leaves while veins stay green
Magnesium deficiency
Young leaves turn yellow
Sulfur deficiency
Yellowing leaves starting from the tip then become white
Iron deficiency
Yellow spots between the veins, margins and tips
Zinc deficiency
Plant stays small slow or now growth.
CO2 deficiency
This is a short simple guide.
Please refer to other guides. I have tried to post this in wrong place 3 times.