Tensiometers

Yolles David

Soil Scientist

Tension Tension – is negative relatively to

the atmospheric pressure. The units to express the tension

are similar to those used for atmospheric pressure.

Tensiometer Tensiometer – Equipment that

measures the tension that water is holed in soil. The tension readings are in the range from 0 to 0.80 atmospheres (80 cntibars). In tensions above, air penetrates into the pores of the ceramic cup. The result is, discontinuation between the water in the columns of the ceramic cup to the water in the soil columns.

The tension measured by tensiometer occurs dew to capillary tension (matrix potential) of the soil.

The measurements are not influenced by the osmotic pressure, therefore in saline soils pre calibration is necessary.

The Touching Area Between The Ceramic Cup To The Soil Particles

Mercury Tensiometer

Mercury Tensiometer

Soil Solution Suction Cups And Tensiometer

Soil Solution Suction Cups

Mercury Tensiometer

Vacuum Gauge Tensiometers

Vacuum Gauge

Different Types Of Tensiometers

Comparison Table

Atmosphere

BarsHeight cm

pF

0.0010.001 =1 milibar10

0.010.01=1 centibar

101

0.10.1 =10 centibar

1002

11 = 100 centibar

10003

1010 100004

1515150004.17

3232320004.50

Retention Curves In The Tension Level That Tensiometer Is

Functional