Your crop is Magnesium deficient.

• Magnesium is the central atom of the chlorophyll molecule and is essential for photosynthesis and cell respiration.
• Magnesium is a mobile nutrient, and it is easily translocated from older tissue to the growing parts of the plants.
• Magnesium plays a key role in N, P, carbohydrate, oil & energy reactions in the plant.
• Magnesium is a component of pectin, important for stability of cells and phytin.
• Form used by plants: Mg+2