Your crop is Copper deficient.

• Copper activates enzymes and catalyzes reactions in several processes
• Copper is necessary to chlorophyll formation and therefore essential for photosynthesis and respiration
• Many vegetable crops show Cu hunger, with leaves that lose turgor and develop a bluish-green shade before becoming chlorotic and curling
• Important in the role of pollination of self-pollinating crops such as wheat and barley
• Form used by plants: Cu+ or Cu+2