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Soil and tissue nutrient critical levels of macro and micronutrients used in this study.
| Element | Soil test | Tissue nutrient concentrations |
|---|---|---|
| Critical level | Critical level | |
| Soil pH (CaCl2) | 5.5 | — |
| SOC (g kg−1) | 25.0 | — |
| N (g kg−1) | 2.5 | 44.0 |
| P (mg kg−1) | 30.0 | 2.5 |
| K (Cmol kg−1) | 0.2 | 39.0 |
| S (mg kg−1) | 4.5 | 3.0 |
| Ca (Cmol kg−1) | 0.9 | 9.0 |
| Mg (Cmol kg−1) | 0.3 | 2.5 |
| Zn (mg kg−1) | 0.6 | 19.0 |
| B (mg kg−1) | 1.0 | 24.0 |
| Cu (mg kg−1) | 0.2 | 5.0 |
