Elements	Symptoms
N	Excess nitrogen causes excessive growth and a softer plant; leaves will be darker green and sometimes thickened and brittle.
K	Causes N deficiency in plant and may affect the uptake of other positive ions such as Mg and Ca
Ca	Interferes with Mg absorption; high Ca usually causes high pH which then precipitates many of the micronutrient so they become unavailable to the plant
S	Excess of sulfur may cause premature dropping of leaves.
Fe	Possible bronzing of leaves with tiny brown spots.
Mn	Reduction in growth, brown spotting on leaves; shows up as Fe deficiency; found under strongly acid conditions
Zn	Sever stunting, reddening; poor germination; older leaves wilt; entire leaf is affected by chlorosis, edges and main vein often retain more color; can be caused by galvanized metal.
Mo	Intense yellow or purple color in leaves; rarely observed