Boron deficiency
• Provie NPK with microelements . • Do not use too much phosphorus!
Factors affecting boron (B) efficiency. pH rate. Too high phosphorus (H 2 PO 4 - ) concentration. Calcium concentration. Temperature. Substrate type. Do not use 15-15-15 or 17-17-17! This rate of phosphorus is too high!
Compact & curling upper leaves.
Boron.
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