| N | K | Ca | Na | EC |
K | −0.83ns | − | − | − | − |
Ca | 0.87* | −0.95* | − | − | − |
Na | −0.92* | 0.98** | −0.97** | − | − |
EC | 0.84ns | −0.94* | 0.95* | −0.95* | − |
pH | −0.28ns | −0.07ns | −0.36ns | 0.19ns | −0.17ns |