The document discusses various nutritional deficiencies that affect mango trees, including potassium, zinc, iron, boron, salt injury, copper, and black tip. It provides details on the symptoms of each deficiency and recommended management practices. For potassium deficiency, it recommends applying potash fertilizers and incorporating dropped leaves into the soil. For zinc deficiency, it suggests spraying zinc sulphate. For iron deficiency, two sprays of ferrous sulphate are recommended. Boron deficiency is managed by applying boron to each tree. Salt injury can be addressed by growing green manure crops and applying compost and gypsum. Copper deficiency is rectified by applying or spraying copper-based products. Black tip of fruits is controlled by

1. College of Agricultural Technology, Theni
9Affiliated to TamilNadu Agricultural University)
Kullapuram, via Vaigai Dam.
Student
Anoob.D
ID NO 2015021011
Course teacher,
Dr.Parthasarathy S
Asst. Professor (Plant Pathology)
Nutritional Deficiencies of Mango

2. Potassium
Symptoms:
• Scorching of leaf margins is the characteristic
symptom of potassium deficiency.
• Scorching starts from tip downwards. Fruit
quality is reduced. Trees with potassium
deficiency are easily prone to pest and disease
attack.

3. Management:
• Application of 1 kg muriate of potash or
sulphate of potash along with 2 kg urea and 6
kg super phosphate during July-August in the
basin could rectify potassium deficiency.
• Dropped leaves should also be incorporated
along with manures to enrich the soil health
and fertility.

4. Zinc
Symptoms:
• The leaves become small and narrow with leaf
margins bent upward or downward. Inter nodal
length is reduced drastically and the twig with
crowded leaves gives rosette appearance.
• Pale inferential areas and green veins are
typical of zinc deficient leaves.
• Zinc deficiency is conspicuously seen in
alkaline, saline and sandy soils

5. Management:
• Zinc deficiency can be rectified by spraying of
zinc sulphate 5 g +10g urea /1water twice at 15
days interval.

6. Iron
Symptoms:
• The leaves loose green colour and turn white
and is called “Bleaching”.
• The size of the leaf is reduced. In severe cases
of iron deficiency, the leaves dry from tip
downwards.
• The deficiency is common in soils with high
calcium content. Hence, the effect is known as
“calcium induced iron chlorosis”.

7. Management:
• Two sprays at fortnight interval with ferrous
sulphate 2.5 g per liter.

8. Boron
Symptoms:
• Cracking of fruit is the characteristic symptom
of boron deficiency.
• Lusterless leathery leaves with thickened veins
are the other associated symptoms.
• Brown areas in yellow fruit pulp are
conspicuous.

9. Management:
• Application of 250gm boron per tree (10-15
year old) with recommended dose of manures
during July-August.

10. Salt injury / Toxicity
Symptoms:
• The leaves are scorched due to excess salt in
soil or irrigation water. The leaves lose their
natural colour and turn to bronze colour.
• Tip burning is also seen in severe cases of salt
injury.

11. Management:
• Raise Diancha as green manure crop with
onset of monsoon in the inter-spaces of the
orchard during tree bearing years and remove.
• Farm yard manure and compost should be
applied adequately every year.
• Gypsum filled gunny bag if kept in flowing
irrigation water will reduce salt effect.

12. Copper
Symptoms:
• Copper deficiency symptoms frequently
develop on young trees which generally occur
due to heavy nitrogenous fertilization.
• It may also be accompanied by Zinc deficiency
symptoms.
• The appearance of weak terminal shoots
followed by defoliation and die back of
branches.

13. Management:
• Application / spraying of Copper (250 g/ 10
years tree) or Copper oxychloride (0.3%) at
monthly interval.

14. Black tip
Symptoms:
• Necrosis on tip of fruits.
Management:
• Spray borax at 3-4kg per 500L of water.