Manufacturer: Irrometer Probe: Watermark Cost: 200SS-5 Watermark $ 38 (€ 35)
available as portable devices. For irrigation scheduling, we recommend using the SM150T low-cost version soil moisture sen- sor with our SapIP wireless data loggers. The sensors can be buried and left in place with no maintenance for up to ten years.
Description: The Watermark soil moisture sensor acts as an artificial root, exchanging water with the surrounding soil just as a plant root does. This exchange enables measurement of how much effort is required by the plant to extract the water that is avail- able in the soil, not a measurement of how much there is. The Watermark is designed to be a maintenance-free permanent sensor, with highly corrosion-resistant electrodes
embedded within a matrix which automati- cally buffers for salinity.
Manufacturer: Pessl Instruments Probe: P54D Cost: $ 166 € 154 per sensor, calibration in- cluded
Description: The P54D is a low-cost sensor that offers very accurate calibrations and senses temperature along with soil moisture. It has a larger volume of influence. It deter- mines volumetric water content, measuring the dielectric constant of the soil using ca- pacitance technology and soil temperature. High frequency minimises salinity and textural effects in most soils.
Manufacturer: Sentek (Note: Valmont-Val- ley sells mainly Sentek probes) Probes: TriSCAN, Drill and Drop Cost: $ 190 to $ 1,260 (€ 176 to € 1,170)
and app or easily integrated with other sys- tems and dashboards, all free of charge.
Description: Drill and Drop probes provide soil moisture and temperature readings every 10 cm in all soil types, and salinity readings as an option. They are fully encapsulated and can be completely buried. The TriSCAN sensor is able to distinguish between soil water con- tent and salt content. It continuously tracks fertiliser, salinity and soil moisture levels at multiple points in the soil profile. Sentek’s capacitance-based technology provides
near-continuous measurements and 0.01 per cent change repeatability.
▶ FUTURE FARMING | 22 May 2020 39
PHOTO: SENSOTERRA
PHOTO: METER GROUP
PHOTO: DYNAMAX
PHOTO:SENTEK
PHOTO PESSL INSTRUMENTS
PHOTO IRROMETER
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