Measuring Soil Water Content
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Two types of water content
1) Volumetric water content
• Volume of water per given volume
2) Mass water content
• Mass of water per given mass of dry soil
,Specific Heat
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Amount of energy to raise T by 1°C per g
Soil water > soil solids >> soil air
- Wet soils will require more energy to warm than dry ones
Factors Affecting Aeration
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- Drainage
- Rates of Respiration (affected by organic matter inputs and T)
- Depth in profile
- Soil Heterogeneity
- Tillage
- Compaction/shrink-swell
- Root and animal channels
- Seasonal differences
- Vegetation
Thermal Properties of Soil
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Specific Heat
Thermal conductivity
, Rainfall Distrubution
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World average rainfall is 750 mm (~30 inches)
Rainfall is highly variable geographically
Soil Temperature Control
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Organic residues or mulch on soil surface
- Reduces erosion
- Buffers extremes in temperatures
- Keep soil cool in hot weather
- Keep soil warm in cold weather
Adhesion
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Attraction of water molecules for solid surfaces (e.g., soil or glass)
Thermal Conductivity
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Give this one a try later!
Two types of water content
1) Volumetric water content
• Volume of water per given volume
2) Mass water content
• Mass of water per given mass of dry soil
,Specific Heat
Give this one a try later!
Amount of energy to raise T by 1°C per g
Soil water > soil solids >> soil air
- Wet soils will require more energy to warm than dry ones
Factors Affecting Aeration
Give this one a try later!
- Drainage
- Rates of Respiration (affected by organic matter inputs and T)
- Depth in profile
- Soil Heterogeneity
- Tillage
- Compaction/shrink-swell
- Root and animal channels
- Seasonal differences
- Vegetation
Thermal Properties of Soil
Give this one a try later!
Specific Heat
Thermal conductivity
, Rainfall Distrubution
Give this one a try later!
World average rainfall is 750 mm (~30 inches)
Rainfall is highly variable geographically
Soil Temperature Control
Give this one a try later!
Organic residues or mulch on soil surface
- Reduces erosion
- Buffers extremes in temperatures
- Keep soil cool in hot weather
- Keep soil warm in cold weather
Adhesion
Give this one a try later!
Attraction of water molecules for solid surfaces (e.g., soil or glass)
Thermal Conductivity
Give this one a try later!
