PRS Technology

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Relationship to plant uptake

Relationship between cumulative N supply rates measured using PRS™-probes during the first 30 days after planting and potato plant N uptake at time of top kill.
Source: Dr. Derek Lynch, OACC, Truro, NS., and Dr. Bernie Zebarth, AAFC, Fredericton, NB.

The PRS® Probe is an effective surrogate for bio-mimicking nutrient absorption by plant roots. All of the principal edaphic factors affecting nutrient supply to plant roots also affect nutrient supply to the PRS® Probe. It is not surprising then that the PRS® Probe nutrient supply rates are highly correlated with plant nutrient uptake. Many studies have looked directly at the ability of the PRS® Probe to correlate directly with plant uptake by analyzing plant tissues for nutrient concentrations with great success (see examples here).

Correlations between PRS® Probe supply rates and plant uptake:

Ionic Species

PRS® Probe type

R2

References

Nitrate

Anion

0.86

Qian & Schoenau, 1995

Phosphate

Anion

0.71

Schoenau et al., 1993

Sulfate

Anion

0.98

Greer & Schoenau, 1994

Borate

Anion

N/A

Greer & Schoenau, 1994

Chloride

Anion

N/A

Greer & Schoenau, 1994

Potassium

Cation

0.68

Qian et al., 1996

SAR

Cation

N/A

Greer & Schoenau, 1996

Chromium

DTPA-Anion

0.99

Tejowulan et al., 1994

Manganese

DTPA-Anion

0.68

Tejowulan et al., 1994

Iron

DTPA-Anion

0.71

Liang & Schoenau, 1995

Nickel

DTPA-Anion

1.00

Liang & Schoenau, 1995

Copper

DTPA-Anion

0.75

Tejowulan et al., 1994

Zinc

DTPA-Anion

0.74

Tejowulan et al., 1994

Cadmium

DTPA-Anion

0.98

Liang & Schoenau, 1995

Lead

DTPA-Anion

0.98

Liang & Schoenau, 1995

Metsulfuron

Anion

0.98

Szmigielska et al., 1998