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Chemical characteristics of the river sand used in the experiment
| Mean ± s.e. | |
|---|---|
| NH4-N (mg kg−1) | 1 ± 0·01 |
| NO3-N (mg kg−1) | 1 ± 0·01 |
| Bicarbonate-extractable K (mg kg−1) | 17 ± 1·2 |
| Bicarbonate-extractable P (mg kg−1) | 2 ± 0·01 |
| Available S (mg kg−1) | 4·6 ± 0·34 |
| Organic carbon (g kg−1) | 0·006 ± 0·001 |
| Conductivity (dS m−1) | 0·018 ± 0·003 |
| pH (CaCl2) | 6·1 ± 0·12 |
| pH (H2O) | 6·7 ± 0·09 |
