Nutrient  deficiency	Symptoms	Remedies
Nitrogen	Leaf size is small,uniformlly dull green or yellowish. Dieback of twigs & gradual premature defoliation, result in thin, bushy appearance of tops. Reduction in fruit production but quality is not lowered size may be reduced.	Application of ammonical or nitrate fertilizers.
Phosphorous	Tree have sparse, dull green to bronze tinted foliage. Older leaves fall, necrotic lesions. Leaves show burnt appearance. Fruit are deficient in juice. fruit yield & quality .	Superphosphate,diammonium phosphate @ 1 to 2 kg/tree.
Magnesium	Yellowish green blotch colour near the leaf base. Only green portion remain at the tip & the base of the leaf & invested 'v' shape defoliation of bearing trees.	50-100gms of mgso4/tree along with fertilize plaut may be Drenched with magnesium sulphate.
Sulphur	Youngest small leathery leaves are the yellow,necrofic lerions,leaves are fall early. fruits are smaller. Abnormal yellowing of new growth, die back of  twig little growth.	Potassium sulphate @ 3-5% spray solution.
Zinc	Chlorotic blotches on leaves there region is green. Small,narrow,severely chlorotic younger leaves forms small clusters & are rigidly upright.	Znso4 lime mixture 3-4 times various stage spraying I) New flush ii)One month after iii)Flowering iv)Fruit set
Iron	Interregional areas are yellow & eventually entire leaf turn ivory colour. Partially defoliate, dieback. Increase juice acidity & also roughness of the skin.	Ferrous sulphate lime mixture. Fe-EDTA @ Fe-EDHA control iron chlrosis.
Manganese	Chlrotic reticulation Christmas tree like pattern against a severely chlrotic background. dot like chlrosis:dot like lestons on leaves. defoliation, loss of vigous & lower yield.	Manganese sulphate lime mixture. Under natural soil condition 120gms manganese sulphate in 100 liters of water.
Copper	The gum pockets at the nodes of the twigs & the brownish excrescence on fruit. The cracking of fruit occurs. The leaves may also develop brown stained areas. The shoots are long, vigorous plant & often "s" shaped giving the appearance of excessive nitrogen fertilizer.	A bordeause mixture spray. Spraying with any micronutrient formulation containing copper can also correct its deficiency.
Boron	The early symptoms noticed is the yellowing along the midrib & lateral veins.	Borax to the soil at the rate of 5-20 grams per tree. By spraying 0.5% borax on the foilage,once or twice a year soon after new flush.
Molybdenum	Water soaked areas in leaves. These areas develop in to large interveinal yellow spots with gum on the lower leaf surface. These conditions large irregular brown spot with a yellow hole may be found on the fruit.	Sodium or ammonium molybdenum(0.05%). Alternately spraying with micronutrients spray solution containing Mo
Nutrient toxicity	Symptoms	Remedies
Nitrogen	Die-back, gummosis of citrus trees, ammoniated fruits & multiple beeds.Secondary symptoms are unusually deep green colour of the foliage.	Surplus of nitrogen can be avoided.
Phosphorous	Too high phosphorus content sometimes gives rise to or accentuates zinc & copper deficiencies in citrus As in other species.	Surplus of phosphorous can be avoided.
Boron	Yellowing of the older leaves around the margins & b/w the veins & a dying back of the lips & margins are some of the symptoms.	Surplus of boron can be avoided.
Potassium	Chlorophyll in many of the leaves tends to fade out it becomes rust in appearance. There are localized dead areas, usually on one side of the leaves. growth & vigour retarded. Leaf curl, puckering & malformation & drooping of leaves.	Sulphate of potash or nitrate up to 3% spray solution.
Calcium	Loss of chlorophyll in young leaves. Veins teen yellow colour. leaves are smaller & thicker. Branches dry from the tips downwards. Weak shoot die, sprout from the side buds.	Lime @ 4 to 6 kg/tree. Quick lime @ 1.5 to 2 mts Calcium nitrate 2-3 times @ 2-3%.