Integrated nutrient management in mango

1
Role and deficiency symptoms of secondary
nutrients in Mango
Introduction

Improved yield in mango require balance
application of nutrients in proper form. But
continuous and imbalanced use of inorganic
fertilizers affect the soil health as well yield
by Affecting useful soil microbes and remains
of chemical residue become toxic to plants and
adversely affecting health of the mango plant.
2
Role and deficiency symptoms of secondary
nutrients in Mango
Introduction

• Therefore, it is important to use chemical
  fertilizers judiciously to get higher yield
  without affecting soil health.
• Integrated nutrient management is a good
  agricultural practices which improves yield in
  mango without affecting soil health.
• Before adapting integrated nutrient management
  practice in mango, it is utmost important to have
  an idea about the role and deficiency symptoms of
  different elements on mango . Therefore in this
  RLO you will learn the role and deficiency
  symptoms of secondary nutrients on mango.

3
Role and deficiency symptoms of secondary
nutrients in Mango
Role of calcium

• Calcium is important in the assimilation of N and
  transport of carbohydrates and amino acids.
• Calcium plays an important role in the structural
  functions in the cellular membranes and walls
  throughout the entire plant.
• The fruits have an increased demand for Ca to
  maintain pulp consistency during growth.

4
Role and deficiency symptoms of secondary
nutrients in Mango
Role of calcium

• Adequate calcium produced fruits firmer, with a
  better appearance, better resist handling and
  transport and have a lower incidence of
  physiological disturbance.
• The greatest demand for Ca occurs during the
  post-harvest flush and the initial development of
  the fruits.

5
Role and deficiency symptoms of secondary
nutrients in Mango
Role of Magnesium

• Magnesium occurs in the chlorophyll molecule and
  in enzymes that induce the formation of amino
  acids for protein synthesis. It also participates
  in P transport within the plant.
• Application of excess amounts of Ca and K
  decrease the uptake of Mg.

Role of sulphur

• Sulphur is the principal component of amino acids
  and vegetable proteins.
• It is an enzyme activator and participates in
  chlorophyll synthesis.
• When deficient, mango growth is slowed and leaf
  loss is provoked.

6
Role and deficiency symptoms of secondary
nutrients in Mango
Deficiency symptoms of calcium

• Lower quality fruits and collapse of the
  internal pulp, attributed to an imbalance
  between low Ca and high N.
• Reduced growth of foliage due to ca deficiency.
• Its deficiency is associated with occurance of
  physiological disorders like Softnose.
• The apical twigs and shoots remain small and
  slightly lighter green than normal.

7
Role and deficiency symptoms of secondary
nutrients in Mango
Deficiency symptoms of magnesium

• Deficiency of Mg reduces development, causes
  premature shedding of leaves and decreases
  yield.
• Application of excess amounts of Ca and K
  decrease the uptake of Mg.
• In the developing leaves, yellowing white areas
  between the main veins on both sides of mid-rib
  run parallel towards the margin.
• Prominent yellowish specks first visible on both
  sides of mid rib and follows chlorosis.

8
Role and deficiency symptoms of secondary
nutrients in Mango
Deficiency symptoms of sulphur

• Deficiency of S causes necrotic spots on a green
  background on the youngest leaves, there is also
  premature leaf shedding.
• Sulphur availability is reduced by the continuous
  use of fertilizers that do not contain S.
• When deficient, mango growth is slowed and leaf
  loss is provoked.
• Its availability is reduced by the continuous use
  of fertilizers that do not contain S.
• Deficiency of S causes necrotic spots on a green
  background on the youngest leaves, there is also
  premature leaf shedding.

9
Role and deficiency symptoms of secondary
nutrients in Mango
Deficiency symptoms of sulphur

• Symptoms may be similar to N deficiency and are
  most often found in sandy soils that are low in
  organic matter and receive moderate to heavy
  rainfall.
• Plant stems are stiff, thin, and woody.
• Higher concentration of sulphur-dioxide in the
  atmosphere near brick and other industrial units
  burning coal has resulted in Black tip.
• Its deficiency leads to side scorching of leaves.

10
Role and deficiency symptoms of secondary
nutrients in Mango
Let Us Sum Up

Nutrients are classified according to their
importance to plants and are categorized by
Primary, Secondary and Micro nutrients.

In addition to the primary nutrients, plants also
need secondary nutrients like Sulphur (S),
Calcium (Ca), Magnesium (Mg), etc.
Sulphur forms part of two important amino acids
which are part of the many building blocks of
protein. Sulphur is found in B1 vitamin and
several other enzymes.
Similarly, calcium is essential for plant growth,
cell division and enlargement. Calcium is a
component of cell membranes and is important for
developing the root system, shoot tips and
storage organs and magnesium occurs in
chlorophyll and is also an activator of enzymes.
These are required for plant growth in relatively
smaller quantities than primary nutrients.
Any deficiency of the secondary nutrients and
other essential elements reduce the efficiency of
primary nutrient by restricting the yield to low
levels.