some common symptoms of nutrient deficiency

The following table lists some nutrient deficiency symptoms that are commonly observed in plants.

nutrient deficiency	symptoms
Nitrogen (N)	• leaves are pale green or yellow, smaller than normal • lower leaves are affected first, but in severe cases all leaves may show deficiency symptoms • stems are thin, erect, and hard • plants grow slowly
Phosporus (P)	• leaves are dark green, may develop purple coloration, first on undersides and later throughout, due to abnormal production of anthocyanins • death of older leaves • stems are thin and may be shortened • plants grow slowly, and maturity is delayed.
Potassium (K)	• older leaves mottled, with necrosis of leaf tips and margins • leaves may curl and crinkle • a scorch around the entire leaf may eventually occur • chlorotic areas may develop throughout leaf
Iron (Fe)	• distinct yellow or white areas appear between the veins on the youngest leaves • veins remain green, except in case of prolonged, extreme deficiency • in severe cases, younger leaves become white with necrotic lesions