Can be caused by:
• Improper pH
• Nutrient Lockout
• Phosphorus/Potassium Toxicity
Preventative: Be sure to carefully monitor the amount of phosphorus in the grow media and the water used on plants. This is because there is an antagonistic relationship between phosphorus and zinc. When there is an excess amount of phosphorus it can cause a zinc deficiency.
If there is a zinc shortage, adding a small amount of the nutrient to replenish the water or grow media is simple. Since this is a micronutrient, always apply small amounts over extended periods of time, since over application can lead to a zinc toxicity.
• Zinc Sulfat
• Chelated Zinc
• Zinc Oxide