Your crop is Potassium deficient.

• Potassium activates more than 60 enzymes
• Potassium regulates many essential processes in the plant including enzyme activation, photosynthesis, water use efficiency, starch formation and protein synthesis
• Potassium is one of the best investments a grower can make in protecting a crop against disease, as it increases plant resistance to both biotic and abiotic stress factors.
• Form used by plants: K+