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SESSION TWO
A. LIMITATION OF PEAT
1. POOR NUTRIENT UPTAKE
2. HIGH DOSAGE OF FERTILIZER
3. FIXATION OF MICRO NUTRIENT
1. POOR ROOT ACHORAGE
2. POOR ACCESSIBILITY
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PEAT peat
peat
PEAT
peat PEAT
original ground level
3. HIGH LEACHING
water water
water
fertilizer
water
water
fertilizer fertilizer
4. WATERLOGGED
LIMITATION OF PEAT AFTER DRAINAGE
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soil water table
peat under water
1. IRREVERSIBLE DRYNESS Irreversible dryness on top layer
2. FIRE PRONE
3. SUBSIDENCE OF PEAT
3.PROCESS OF PEAT SUBSIDENCE
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PEAT peat
peat
PEAT
peat PEAT
original ground level
3a. Process of subsidence
water
Water
water water
Water
air air air
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Original ground level
3b. Process of subsidence
ground level after subsidence
air air air
air air
air
air
PEAT UNDER SOIL WATER TABLE
GROUND LEVEL AFTER SUBSIDENCE
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3c. Process of subsidence
ORIGINAL GROUND LEVEL
Example of subsidence
Example of subsidence
Advantages of peat
Advantages of peatland
1. ABUNDANT WATER SOURCE
2. POSSIBLE WATER TRANSPORT SYSTEM
3. Cheap transport cost
.
1. LOW pH
2. LOW NUTRIENTS
3. HIGH CARBON NITROGEN RATIO
4. HIGH CATION EXCHANGE CAPACITY
5. LOW BULK DENSITY
6. LOW BEARING
7. HIGH POROSITY
9. HIGH WATER TABLE
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