1. Nutrient Uptake by Root and Leaf and Nutrient Distribution

2. Nutrient

3. Soil solution, soil particle, soil colloid

4. Nutrient
Donnan Free Space
Cation Exchange Capacity (CEC)

10. IN XYLEM Plasmodesmata (Symplastic Pathway) plasma H2O Tip (Ca) Leaf
Next cell
Plasmalemma
Cytoplasm
Tonoplast
Vacuole
Plasmodesmata
(Symplastic Pathway)
plasma
Endodermis
Cortex Epidermis
Root hair
Soilparticle
Soil solution

11. Factors affecting Nutrient 1. Ion diameter ION UPTAKE BY ROOT
Root Interception (Soil – root Surface)
Mass flow (Transpiration Stream)
Diffusion (Conc. Gradient)
Factors affecting
1. Ion diameter
radius
Li+ > Na+ > R+ > Ce+
Uptake rate

12. Nutrient 2. Valency 3. Metabolic activity 4. Interaction Between Ion
Uncharged mol : <Cat+ , An- < Cat2+, An2-< Cat3+<An3-
Uptake rate
3. Metabolic activity
Energy Respiration
Active Uptake (O2, Temp., CHO- Light)
4. Interaction Between Ion
- Competition (same valency & ion size)
- Competition K+ inhibit NH4+ uptake
Ca2+ & Mn2+ inhibit Mg2+ uptake
Ce- inhibit No3- (น้ำประปา, น้ำทะเล)

13. 7. Cation – Anion Relationship 8. External Concentration
5. pH (H+ , OH+ )
pH : uptake K+ NH+ No3-
6. Ion Synergism
Ca2+ K+ uptake – low pH
K+ uptake – high pH
7. Cation – Anion Relationship
Electrical charge balancing
8. External Concentration
9. Internal Concentration & Nutrition Status
10. Plant Development & Nutrifional Requirement

14. TRANSLOCATION OF ION IN XYLEM
Diffusion (Cation exchange, , valency, Organic compounel
Mass flow (Transpiration stream)
Resorption (Companion cell)
Resorption (Accumulation, Phloem)
Plant age
Time of day (Morning, afternoon, Dark, Light)
External Concentration
Internal Concentration
Uncharged Molecule > ions

15. (Highly hydrated Polysaccharide)
TRANSLOCATION OF ION IN PHLOEM
1. Components :
- Sieve tube elements
- Companion cells
- Parenchyma cells
Sieve Plate Pore
(Plasmodesmata)
Callose
(Highly hydrated Polysaccharide)
Swelling - heat treatment
Blocking - mechanical injury of phloem

16. Nutrient 2. Composition of phloem sap : (using aphid) exudate : pH 7-8
Solids 15-25% drymatter
Sucrose 90%
Organic acid
Organically bound N
K>P > Mg > S > Ca (Micro.-rare)
Cation > Anion
(Amino acid for compensation)

17. Nutrient 3. Mobility of mineral element in phloem
Mobile Intermediate Immobile
K Fc Li
Ru Mn Ca
Na Zn Str
Mg Cu Ba
P Mo B S Cl

18. Active Leaf Senescence Leaf (elements)
Nutrient
4. Direction of Phloem Transport
Xylem : Unidirection
Phloem : Bidirection
(Source Sink)
Active Leaf Senescence Leaf (elements) * * *
- Root, Shoot apice, fruit, seed, Stressed tissue

19. Nutrient * 5. Mechanism of Translocation Sink – Source Relationship
Others
- Retranslocation (Shoot root)
(Toxic elements : Na+, Cl-)
Transfer between Xylem – Phloem
(Active transport from xylem to
phloem of elements) good for translocation
to active sites *

20. Nutrient 6. Remobilization (except Ca, B)
Seed germination, Insufficient supply,
Interupted supply, Reproductive stage, Senescence
Nutrient Symptom Remo.
N, K, Mg, P Old Leaves Very good
S Young Leaves Insuf.
Fc, Zn, Cu, Mo Young Leaves Very low
B, Ca Young Leaves
& apical meristem nil

21. Nutrient ION RELEASE Leaching Guttation Excretion Senescence organ
Exchange (Ion Balance)

22. Nutrient MOBILITY Mobile Intermediate Immobile K Fe Ca Na Mn B
Mg Zn Li
P Cu Sr
S Mo Ba Cl Rb

23. Nutrient ION UPTAKE BY LEAVES & OTHER AERIAL PARTS
1. Uptake of gases through stomata
CO2, O2 gas exchange
Mineral nutrient in form of gases : SO2, NH3, NOx
SO2 uptake through stomata SO42- uptake through root
Competitive of SO2 to CO2 in C3 – Pn pathway (RubP)

24. Nutrient 2. Uptake of Solute 2.1 Uptake through stomata
2.2 Structure & Function of Cuticular layer
Structure :
Cuticular layer = layer of wax & Cutin & Pectin,
hemicellulose & Cellulose
Cutin = a condensation product of C18
hydroxy fatty acids with
semihydrophilic properties
Function :
Protect the excessive water loss
Protect against excessive leaching of solutes by rain

25. Nutrient 3. Factors affecting uptake rate 3.1 External factors
Concentration, Valency,
Temperature
Environments (thickness of C. I.)
- shade, unshaded leaves
Light, temperature water evaporation from foliar spray
3.2 Internal factors
Nutritional status of plant (deficient > well supplied)
Leaf age (old uptake )
Metabolic activity
Sink activity
Membrane permeability
Thickness of cuticle

26. Nutrient 4. Foliar Application of Mineral Nutrients
more rapid than root application
more specific
4.1 Problems:
1) Low penetration rate (esp. thick cuticle)
2) Run – off from hydrophobic surface
3) Washing off by rain
4) Rapid dry of spray solution
5) Limited rate of retranslocation (ex. Ca2+)
6) Limited amounts (Concentration & leaf burn)
aver. 1%
except. Urea 10%

27. Nutrient 4.2 When to apply through leaf
Low nutrient availability in soil (pH, soil type, fixation, solubility)
Dry topsoil
Decrease in root activity during reproductive stage
Increase in protein content of cereal seeds
Increase in Ca content of plant parts (Fruit, tip)
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