- What are PRS™-probes?
- What do the PRS™-probes measure?
- How do the PRS™-probes work?
- How are the PRS™-probes used?
- How are the PRS™-probes analysed?
- What makes the PRS™-probe a desirable research tool?
- How do nutrient supply rates compare to conventional nutrient extractions?
- Does the PRS™-probe simulate biological availability as verified by correlations with plant uptake?
- Why does ion activity need to be accounted for when measuring soil nutrient bioavailability?
- How do the PRS™-probes differ from resin beads in mesh bags?
- What is the benefit of using PRS™ -probes versus raw membrane?
- What led to the development of the PRS™-probe technology?
- How many PRS™-probes are required to complete a study?
- What are some important considerations when using PRS™-probes in situ?
- Are there soil type concerns when using PRS™-probes?
- Are the PRS™-probes susceptible to insect or animal damage?
- Will a nutrient pulse through the soil displace an adsorbed nutrient on the PRS™-probe through mass action displacement?
- How should method blanks be handled?
- Past Research
Frequently Asked Questions
Topics: General / Technical / Logistical / Ordering / Past Research
How many PRS™-probes are required to complete a study?
As with any in situ research tool, the number of PRS™-probes required to accurately assess soil nutrient dynamics depends on: the size of your experimental unit; homogeneity of soils; the expected variability within treatments; and, the number of replications. If you are planning to measure cumulative nutrient supply rates throughout the growing season, then twice as many PRS™-probes are required, as freshly recharged PRS™-probes will need to be placed in each soil slot immediately upon removal of the current ones. A few extra PRS™-probes are sent with each order in case of accidental breakage during installation. These extra PRS™-probes also can be used as method blanks during analyses, but we will charge for analysis of method blanks as we would any other sample. It is best to decide at the beginning of your study the number of blanks you need for your project and include the number of blanks in your overall sample number. It is better to let us know how many samples are needed (Plots x Treatments x Sites = # Samples) rather than number of probes. An R&D coordinator will determine actual probes numbers after a discussion of the study site and objectives.
Note: a rule of thumb is to bury as many pair of PRS™-probes in each experimental unit as you would collect soil samples. The entire set of PRS™-probes then can be bulked together into one bag and eluted to create a single eluate sample for analysis, much like composite soil sample (see following figures for examples).