Campbell HydroSense II Guia do Utilizador descarregar pdf (Página 33)

HydroSense II Soil Moisture Measurement System

12 Soil Physics Primer

12.1 Soil Bolus Testing

Soil moisture testing and the soil’s ability to store water and make it available to

agricultural crops is highly dependant on the type of soil at the site. There are 3

major non-organic components of soil that affect its texture: sand, silt and clay.

Each of these components has a progressively smaller grain size and this affects

its physical properties.

Sand has a grain size from 0.05mm up to 2mm, silt has a grain size 0.002mm up

to 0.05mm and clay has a particle size less than 0.002mm.

Below is a simplified soil texture triangle. The goal of the soil triangle is to

attempt to classify soil according to its constituent particles.

Source - http://www.landscape -and-garden.com/garden -soil/soil-triangle.aspx

A simple field test to determine soil type is called the Soil Bolus Test and is

widely used as a guide when full laboratory particulate analysis is not available.

Take a small amount of soil in hand.

Wet soil to field capacity (just damp).

Roll the soil into a ball.

Push soil between thumb and forefinger to form a ribbon.

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Campbell HydroSense II Guia do Utilizador Página 33