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Soil Particle Size and Porosity

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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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