Besides agrometeorological stations, sensors from the American manufacturer Irrometer can be placed in the soil at various locations to measure soil water potential, which is expressed in centibars (kilopascals).

Sensor diameter: 22 mm
Sensor length: 83 mm
Sensor weight: 75 g
Cable length: 150 cm

Very simple and effective sensors for measuring soil moisture over larger areas. The affordable price of the sensors allows you to measure soil moisture at two or more depths on every irrigated plot.

Possibility of connecting to the Watermark Meter digital reader for reading water potential values. Ability to measure soil water potential in the range of 0-199 cb (0-199 kPa).

The sensor consists of an electrode located in a granulated matrix (of gypsum), coated with a hydrophilic material that ensures good water exchange with the surrounding soil, and its strength is provided by a perforated stainless steel casing, which is attached at the ends with plastic material.

The sensor does not require calibration depending on the soil type.

WHEN TO START IRRIGATION?

0 – 10 cb = Soil well saturated with water
10 – 30 cb = Soil contains an adequate amount of water for normal plant growth and development (except for sandy soils, where water deficit starts to appear around 30 cb)
30 – 60 cb = Typical values when irrigation is needed (except for heavy soils)
60 – 100 cb = Typical values when heavy soils need irrigation
100 – 200 cb = Soil becomes too dry for maximum yields

One method of installing the 200SS sensor – Youtube

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