Soil test P

Regression model

R²

Olsen vs Mehlich 3

Y = 1.54x + 14.56

0.872

Olsen vs Kelowna

Y = 0.97x + 8.50

0.877

Mehlich 3 vs Kelowna

Y = 0.61x + 0.08

0.939

Olsen vs Bray & Kurtz-1

Y = 1.27x + 11.68

0.895

Kelowna vs Bray & Kurtz-1

Y = 1.27x + 1.53

0.951

Mehlich 3 vs Bray & Kurtz-1

Y = 0.79x + 0.81

0.948