Characteristics and types of Rhizon soil moisture samplers

Characteristics of Rhizons

All Rhizon soil moisture samplers have the following characteristics

  • non destructive: the soil structure stays intact
  • inert material: no ion exchange, no adsorption
  • mean pore size 0,15 µm, no filtration needed before analysis
    • new: also Rhizons with a pore size of 0,6 µm are available
  • low dead volume
  • for use in saturated and unsaturated parts of the soil
  • fit for measurement of all dissolved components in the soil moisture
  • can be used for repeated and reliable sampling.

Furthermore, they are disposable and leak tested. They are available in packages of 10 Rhizons.

Several types of Rhizons for pore water sampling

To meet the demands of different areas of research, we developed different groups of Rhizons, each of which consists of several types. Three groups of Rhizons have an inert micro porous tube, closed at one end and at the other end connected to flexible, strengthened PVC/PE tubing with 1 mm internal diameter and a luer-lock connector. Those three groups are:

  • MicroRhizons, the small Rhizon with a 1 mm outer diameter, especially for use in the RhizonBox (the upper picture)
  • Rhizons, the standard size Rhizons with a 2.5 mm outer diameter, for use in pots, vessels, cores (picture 2 and 3)
  • MacroRhizons, the large type of Rhizon with a 4.5 mm outer diameter, especially for use in the field (lowest picture)Rhizon


All Rhizon samplers function when the soil is humid. When the soil gets too dry, the Rhizons are not able to extract pore water anymore. After rewetting the soil, they will function again.

Special types of Rhizons

For experiments where passive irrigation is demanded, you might consider

For all types of experiments for which you need other Rhizons, we develop and produce customized Rhizons, called

  • Specials. Don’t hesitate to ask us about the possibilities.

Sampling accessories

AccessoriesBefore you can take your samples, you will need additional accessories to create a vacuum. This can be either a syringe (for Rhizons with a female Luer-Lock) or a needle and a vacuum tube (for Rhizons with a male Luer-Lock). For field experiments, extension tubing might be useful. We could advise you about the best accessories for your experiments.




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