Soil properties

Number of observations (n)

Pearson correlation coefficient (r)

Initial soil samples

pH

10

0.29

Organic matter (%)

10

0.61^*

Cation exchange capacity (cmol∙kg⁻¹)

10

0.63^*

Electrical conductivity (dS∙m⁻¹)

10

0.29

Clay (%)

10

0.45

Others

(Ca + Mg)/K ratio^†

40

0.64^*

Soil moisture (%)^‡

366

−0.02