NUTRIENT	SYMPTOM	REMEDIES
N	loss of green colour, even paleness. Old leaves shed early cause foliage cover to become thin, and twigs to die back. Tree growth is retarded, and cropping suffers through poor fruit set and smaller fruit.	Nitrogen fertilisers include ammonium nitrate, urea, ammonium sulphate, ammonium phosphates Urea 4 6
P	leaves are a dull bronzed green and they shed readily . affects fruit quality, causing misshapen fruit with open centres and coarse, thickened rinds	supplied in superphosphate, ammonium phosphates (MAP or DAP),
K	slower tree growth, small leaves and a heavy leaf fall, often preceded by the leaves turning yellow or bronze. Dieback follows in the weakened twigs, and bloom decreases	can be corrected by applying potassium chloride (muriate of potash) or sulphate of potash, or by using mixed or compound NPK fertilisers
Mg	produces a very distinct yellowing towards the apex of the older leaves, with a triangular area remaining green at the leaf base. commonly referred to as "bronzing".	Magnesium nitrate1 kg/100 LAlternative spray:(a) magnesium sulphate (Epsom salts) + calcium nitrate 1 kg/100 L 1 kg/100 L
Zn	Leaf symptoms include small, narrow leaves (little leaf) and whitish-yellow areas between the veins (mottle leaf). tree.	Use an annual foliar spray (zinc sulphate) on the spring flush leaves when they are about two-thirds their full size @SpraysZinc sulphate (23% Zn) + manganese sulphate150 g/100
Cu	sides of angular young shoots. They have a blister-like appearance. The rind of deficient fruit develops brown gum-stained areas, and the fruit splits.	Copper sulphate n     monohydrate (35% Cu), arugite 55% Cu), copper sulphate
Fe	causes a distinct pattern in the leaf caused by a loss of chlorophyll; only the main veins stay green.	ferrous sulphate (19% Fe), ferric sulphate (23% Fe),
Mn	diffuse pale green mottle between the veins in young and old leaves . Symptoms are more noticeable on the southern side of the tree.	manganese sulphate (26-28% Mn), manganese oxide 41-68%
Ca	fading of the chlorophyll along the leaf margins and between the main veins during the winter months. Small necrotic (dead) spots can develop in the faded areas.	gypsum can correct the deficiency and reduce the deleterious effect of Na. Calcium deficiency can also be corrected by foliar spraying with a water-soluble Ca source.
Sulphur	symptoms resemble those of N, but they first appear on the new growth. Plants are stunted and pale green to yellow in color. Such chlorosis in citrus is worse on new growth because S does not move readily from old to young leaves like N.	corrected by soil application of S-containing fertilizers like ammonium sulfate, potassium sulfate, or magnesium sulfate. Applying gypsum is an
Bo	terminal leaves        turn necrotic, and shed prematurely. Internodes	borax (11% B), sodium pentaborate (18% B), sodium tetraborate
Mo	large yellow spots on the leaves that appear first as less defined water-soaked areas in spring  , later developing into distinct larger interveinal yellow	yellow spots develop deposits of brown gum on the lower leaf surface which later turn black.