PRS Technology

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

To ensure consistent performance, PRS® Probes are regenerated prior to each use by consistently saturating the ion-exchange membranes with the same counter-ions.

PRS® Probes are first soaked (with agitation) in 0.5 M HCl to saturate exchange sites with H+ or Cl-, then repeatedly soaked in NaHCO3 to saturate exchange sites with Na+ or HCO3-.  Each soaking replaces approximately 95% of the ions on the membrane with ions from the soaking solution.  As a final step, anion PRS® Probes are soaked in a solution of 0.01 M EDTA to increase adsorption of P and micronutrients.

Each batch of regenerated probes is tested prior to use by analysis of three subsamples consisting of two probes.  The objective is for regenerated PRS® Probes to have negligible levels relative to those obtained after soil burial. Potential issues should be discussed with an R&D coordinator. 

 

Regenerated PRS® Probes,

2010 to 2012 (n>150)

Typical soil

Ion

(mean ± st. dev.)

(range)

 

ug per 10 cm2

NO3-N

2 ± 1

5 to 1000

NH4-N

0.3 ± 0.4

2 to 10

P

0.3 ± 0.3

0.2 to 10

K

4 ± 3

20 to 200

S

4 ± 3

10 to 200

Ca

30 ± 20

400 to 3000

Mg

4 ± 4

80 to 500

Fe

1 ± 1

1 to 10

Mn

0.1 ± 0.2

0.5 to 20

Cu

0.04 ± 0.12

0.02 to 0.2

Zn

0.1 ± 0.1

0.2 to 2

B

1 ± 1

0 to 3

Al

19 ± 9

10 to 50