Campbell HydroSense II Guide de l'utilisateur télécharger pdf (Page 34)

HydroSense II Soil Moisture Measurement System

Soil Type

Nature of Bolus

Sands

Little or no coherence and cannot be rolled into a ball. Sand grains adhere to fingers.

Sandy Loams

Some coherence, can be rolled into a stable ball and will form a ribbon 15 – 25 mm long.

Loams

Will form a ribbon 25mm long. Smooth spongy feel with no sand grains.

Clay Loams

Ribbon 25-50mm long.

Light clay

Ribbon 50-75mm long. Some resistance to ribboning.

Heavy Clay

Ribbon greater than 75mm. Strong resistance to ribboning.

Once the soil type has been determined, the water content chart in the next

section can be used to determine typical wilting point and field capacity from

Hydrosense II volumetric water content (VWC) measurements. This allows

informed management decisions to be made about a crop.

12.2 Typical Soil Water Levels

Below is a chart of volumetric water content vs soil type. Typical wilting point

and field capacity values are also shown.

In Water Deficit Mode, the HydroSense II will display the mm of rain required

to bring the soil up to field capacity.

The capillary soil moisture content is the plant usable portion of the soil moisture

and is equal to the field capacity minus the wilting capacity.

Clay

Clay/Loam

Loam

Loamy Sand

Sand

Sandy Clay

Loam

Sandy Loam

Silt

Silty Clay

Silt Clay

Loam

Silt Loam

Soil VWC

Soil Type

Soil Type V Soil VWC

Field Capacity

1 2 ... 29 30 31 32 33 34 35 36 37

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Campbell HydroSense II Guide de l'utilisateur Page 34

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