Your crop is Zinc deficient.

• Zinc activates or is a component of several enzymes and therefore affects many metabolic processes in the plant.
• As a component of enzymes, zinc catalyzes the synthesis of fructose-6-phosphate, an important metabolite in glycolysis and therefore photosynthesis.
• Affects the indole-3-acidic acid content which is important for regulation of plant growth.
• Zinc plays an essential role in ATP and protein synthesis.
• Zinc is an essential component of RNA polymerase which catalyzes RNA synthesis, which in turn affects production of proteins.
• Form used by plant: Zn+2