STRUKTUR TANAH. Soil Structure Structure – arrangement of individual particles in relation to each...
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STRUKTUR TANAH
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Soil Structure• Structure – arrangement of individual particles in relation to
each other. Soil structure is the arrangement of particles into small groups, or aggregates.
• Aggregates may be bound together with other aggregates in larger masses called peds.
• Peds come in different shapes that roughly resembel sphere, blocks, columns and plates.
• If the individual particles are arranged in small aggregates with rounded edges, we speak granular structure. This is very desirable for plant growth bc it provides both large and small pores.
• Some soils lack structure. Sandy soils the individual grains act independently of each other. No binding substances hold the particles together, so the soil has no peds.
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Struktur tanah
Struktur granular
Struktur prismatic
Cause and Effect
(description in laboratory)
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+ Flocculation
Pembentukan strktur tanah
(chemical)
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Luas Permukaan
- aggregate of small particles
- large grain
vs
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Agregasi
Pembentukan struktur tanah
Organik dan Anorganik ‘glues’
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Lateral
Stress Forces(what breaks the ‘glue’)
Verti
cal
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Spheriodal
Granular
Sruktur tanah :
Surface Horizons
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Pengelolaan yang tidak baik
Granular
Massive
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Pemadatan horison permukaan
- Platy Structure - compaction
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---- Prismatik ----
Struktur tanah:Lapisan bawah
Increased length in vertical direction
lateral stress > vertical stress
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Blocky Structure:(subsurface horizons)
Increased (relative) age equates stress fractures
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Volcanic Ash Soil
Timber Harvest
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(With Structure)Granular Block
y
Prismatic
Columnar
Platy
Soil Structure
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Columnar structure occurs in dry, desert soils with high sodium content
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Single GrainedMassive
Soil Structure (continued)Without Structure
Pencil is 19 cm
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Soil ConsistenceSqueeze a moist soil ped to see if it is:
Loose* You have trouble picking out a single ped and the structure falls apart before you handle it.*
Extremely Firm The ped can’t be crushed with your
fingers (you need a hammer!).
Firm The ped breaks when you apply a good amount of pressure and dents your fingers before it breaks.
Friable The ped breaks with a small amount of pressure
* Soils with “single grained” structure always have loose consistence.