Nutrient	SYMPTOM	REMEDY
N	This caused the fruit to be misshapen and the rind to be coarse and roughly textured. The fruit in the centre received a moderate Dark green, soft growth Retarded maturity Loss of buds or fruit	5.5-7.0 Avoid excess N fertilizers
P	Coarse, poor-colored fruit.	Poultry and Animal manures at least for 4- 5 years
K	Delay maturity and causes orange to becomes coarse ,large .The rind thickness & becomes rough and regreening increase.	Apply of sandy soil  near the surface & Drought can reduces uptake of K  leading to temporary shortage
Mn	Yellowing around the outer part of the leaves, especially of the older leaves, is the most characteristic effect of manganese toxicity in lemons	If lime is applied at 0.5 to1 tonne per hectare, and this application is repeated each year, it can take up to 4 years to correct the toxicity.
Ca	calcium toxicity visible as spikes ...	calcium ammonium nitrate (10-20% Ca), dicalcium phosphate (32% Ca), single
Bo	Boron toxicity (like salt toxicity) starts as tip yellowing and tip burn, but subsequent yellowing of the apex tends to be mottled. It progresses into a yellowing of interveined areas near the tip.	Leaching irrigations and improved drainage will control the problem
Cu	Causes stunting of roots.	Spraying of Copper Sulphate & Neutral Copper
Mo	Leaves yellow spots develop deposits of brown gum on the lower leaf surface which later turn black.	Molybdenum fertilizers are: Sodium molybdate (30% Mo), ammonium molybdate
Na&Cl	Salt toxicity causes leaf burn and yellowing, starting near the tip. Leaf fall is heavy and dieback follows. Older leaves show the symptoms first.	Rangpur lime and Cleopatra mandarin stocks are the most effective in excluding chloride, where their use is appropriate. P. trifoliata rootstock