| N | K | Ca | Na | EC |
K | −0.81ns | − | − | − | − |
Ca | 0.99** | −0.83ns | − | − | − |
Na | −0.97* | 0.92ns | −0.98* | − | − |
EC | 0.99** | −0.85ns | 0.99** | −0.98* | − |
pH | −0.73ns | −0.30ns | −0.74ns | 0.65ns | −0.68ns |