This document discusses secondary plant nutrients calcium, magnesium, and sulfur. It provides details on their forms of absorption, functions in plant growth, deficiency and toxicity symptoms. Calcium is absorbed as Ca2+ and is important for cell wall structure, enzyme activation, and symbiotic nitrogen fixation. Magnesium is also absorbed as Mg2+ and is essential for chlorophyll formation and amino acid synthesis. Sulfur is absorbed as sulfate and necessary for chlorophyll production, protein synthesis, and oilseed development. Deficiencies of each nutrient cause specific chlorosis symptoms. Toxicity is rare but can inhibit nutrient uptake or cause leaf discoloration.

1. Topic: Secondary nutrients(S, Ca & Mg)
Name: Mohammad Abu bakar
Section: B
Roll#:17301514-065
Department: Zoology
Ma’am Summera Jahan

2. Plant Nutrients
Sixteen chemical elements
are known to be important
to a plant growth &
survival. We can divide
these elements under 2
main groups.
Non - Mineral Nutrients
Mineral Nutrients

3. Non - Mineral Nutrients :
Non - Mineral Nutrients are C, H, and
O. These are found in air and water.
Mineral Nutrients :
There is 13 mineral nutrients
These nutrients are divided
in to 2 groups
 Micronutrients
 Macronutrients

4. Micronutrients
 Micronutrients are the elements which are essential for plant gro
only in very small quantities .
 The Micronutrients are
Mn
Mo
Zn
B
Cl
Cu
Fe

5. Macronutrients
 Macronutrients can divide in to 2 major
groups.
 They are,
Primary Nutrients - N, P, K
Secondary Nutrients - Ca, Mg,
S

6. Calcium - Ca
 Form of absorption - Ca2+
 Function :
1. Stimulate ammonium absorption
2. In the form of Calcium Pectate
responsible for holding together the cell
walls of plants.
3. Important in guard cell physiology
specially in stomata closure.

7. 4. Used activating certain enzymes and to send signals that
coordinate certain cellular activity.
1) Increasing symbiotic fixation of atmospheric
nitrogen.
2) It increasing availability of molybdenum.
Deficiency :
 Young leaves and fruit display Calcium deficiencies first.
 Blossom end root of tomatoes is a classic case of
Calcium deficiency
 Yellow brown spots surrounded by a sharp brown
outline edge.

8.  Toxicity :
Rarely occurs
High level of Calcium can compete
with Magnesium and Potassium uptake
causing their deficiencies.

11. Magnesium - Mg
 Form of absorption - Mg2+
 High Mobility
 Function :
1. Chlorophyll Formation
2. Synthesis of amino acids and
cell proteins
3. Resistance to unfavorable factors

12.  Deficiency :
Deficiency are not common
1. Yellowing between leaf veins,
sometimes with reddish brown tints
2. Early leaf fall.
3. Also affects chlorophyll formation
 Toxicity :
Magnesium toxicity are rare and not
generally exhibited visibly.

14. Sulfur - S
 Essential for the growth and development of
all crops
 Absorbed through the roots in the form of
Sulphate
 Immobile nutrient
 Function :
1. Formation of chlorophyll
2. Production of proteins
3. Synthesis of oils in oilseeds

15.  Deficiency :
1. Yellowing of the entire leaf including
veins ,usually starting with the younger
leaves
2. Leaf tips may yellow and curl
downward
 Toxicity :
1. Leaf size will be reduce
2. Overall growth will be stunted
3. Leaves yellowing or scorched at edges