These are the general symptoms of nutrient deficiency in plants.
Nitrogen: Plant light green, lower leaves yellow to light brown, stalks short and slender, plants stunted.
Iron: Young leaves are chlorotic, with principal veins typically green; stalks short and slender.
Phosphorus: Plants dark green, often developing red and purple pigments; lower leaves sometimes yellow; plants stunted.
Zinc: Leaf spots on older leaves, with spots rapidly enlarging and generally involving the area between the veins; thick leaves; stalks with shortened internodes.
Potassium: Spots of dead tissue, usually at the tips and between the veins; marked margins of leaves.
Boron: Young leaves of the terminal bud are light green at the base; the bud eventually dies.
Magnesium: Mottled or chlorotic leaves, which typically redden; leaf tips and margins turned or cupped upward.
Copper: Young leaves are permanently wilted, with spotty or marked chlorosis.
Calcium: Young leaves of terminal bud hooded; with severe deficiency, dying buds; dying back at the tips and margins of the leaf.
Manganese: Spots of dead tissue scattered over the leaf; smallest veins tend to remain green.
Sulfur: In young leaves, veins and tissue between veins are light green.