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| Treatment | Ageing rate (μg Zn day-1) | ||||||
|---|---|---|---|---|---|---|---|
| 120 | 150 | 165 | 180 | 195 | 210 | Mean | |
| Zn | 15.7 | 14.0 | 13.4 | 8.87 | 8.52 | 8.21 | 11.4 |
| Straw+Zn | 20.1 | 20.5 | 19.5 | 16.2 | 15.5 | 14.9 | 17.8 |
