Sampling Ports for An Instrumented Lysimeter System1
- C. W. Robbins2
An improved method for mounting ceramic-moisture sampling cups and soil-atmosphere sampling tubes in lysimeters is described. The 0.31-m diam by 1.18-m deep lysimeters were constructed from low pressure polyvinyl chloride irrigation pipe (PVC) and contained soil 1.0-m deep. Tensiometer tubes with attached cups, and open-ended pyrex gas sampling tubes were installed at three depths, using sealing ports in the lysimeter walls. The sealing ports were constructed from half of a PVC pipe compression coupler. This system allows for inserting the sampling cups and tubes after the soil has been added and settled. The sampling equipment can also be removed before the soil is sampled and removed when studies are completed. Individual sampling units can also be removed for cleaning or repair during the study without disrupting lysimeter operation. This was not possible with earlier described lysimeter systems.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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