If symptoms appear on new leaves, the problems could related to iron, zinc, manganese, copper, boron, calcium, or sulfur.
Deficiency: Spotting, bleaching of spots between veins (commonly confused with iron/mag def). Usually appears on older leaves first. It will affect the tips of growing points on the plants. Small crops due to zinc def is common. Pale/greyish leaves will be apparent (check for a nice shine to the leaves, if they lack some luster, they might lack zinc!)
When your plants are lacking in zinc they will start to show white patches between the veins of the plant or at the tips of the leaves.
White areas form at leaf tips and between veins. Occurs in alkaline
soils. Zn deficiency can be treated by burying galvanized nails in the
soil. Chemical fertilizer containing Zn can also be used.
Picture 1 & 2 is a zinc deficiencies in vegetative growth