PRS Technology

Food production is essential. Western Ag's lab is OPEN and receiving shipments of samples.

Units

Nutrient supply rate is the net rate of nutrient ion adsorption by the PRS® Probe, expressed as the weight of nutrient adsorbed per surface area of ion-exchange membrane over time. The units used by Western Ag Innovations are μg nutrient/10 cm² ion-exchange membrane surface area/time of burial (i.e., 24 h, 2 wks, 4 wks, etc.). The convention of reporting nutrient supply rates in terms of 10 cm² is to facilitate working with data for diffusion-limited nutrients (i.e., P) having smaller fluxes. However, it is also acceptable to report the number per cm² membrane surface area instead of per 10 cm². The units also may be reported as μg ion/PRS® Probe/time of probe burial providing that the total surface area (17.5 cm²) of the ion-exchange membrane is mentioned somewhere within the document.

Important Note: it is invalid to divide the burial duration into smaller time units since adsorption of ions to the PRS® Probe is not linear over time.