Soil Particle Size and Porosity
Question:
A comparison between two methods of investigating:
What is the effect of changing particle size (i.e. the texture of
soil) on the porosity of the soil?
This is basically investigating in two different ways, "What is the
effect of changing particle size (i.e. the texture of the soil) on the
porosity of the soil?" The two different methods can then be compared.
Predictions
Porosity is the amount of air space in a soil. There are two types of
porosity which are called Total Porosity and Water Holding Porosity.
In my investigation there are two different methods of calculating
porosity. The first experiment enables you to calculate Water Holding
Porosity and the second experiment enables you to calculate the Total
Porosity of a soil.
I would expect Clay soils (very small particles) to have the largest
Water Holding Porosity and therefore also the highest Total Porosity.
I would expect Sands and Sandy soils (large particles) to have the
lowest Water Holding Porosity and therefore the lowest Total Porosity.
Silty Soils should have a Water Holding Porosity and a Total Porosity,
that are greater than Sand but less than Clay. I am basically
predicting that the smaller the particle size of the soil, the greater
the Porosity.
In my experiment these soils will be used :
1. Newport (Silt Loam)
2. Hamble (Silt Clay Loam)
3. Wallasea (Clay)
4. Sand
For Total Porosity and Water Holding Porosity, I would expect the
soils to come in this order (with the largest at the top) :
* Wallasea (Clay)
* Hamble (Silt Clay Loam)
* Newport (Silt Loam)
* Sand
Equipment
Measuring Cylinders
Gooch Crucibles (to hold the soil)
Balance (to weigh the soil)
Beakers (to pour the water)
Chemicals
H2O (Water) Newport Soil Wallasea Soil Hamble Soil Sand
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