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Details of factors used in treatments in the experiment
| Factor A (Nitrogen levels) | Factor B (Charcoal levels) |
|---|---|
| N1: 0 kg N ha-1 = 0 g pot-1 (Control) | C1: 0% by soil weight = 0 g charcoal pot-1(Control) |
| N2: 50 kg N ha-1 = 2 g pot-1 | C2: 2.5% by soil weight = 125 g charcoal pot-1 |
| N3: 100 kg N ha-1 = 4 g pot-1 | C3: 5% by soil weight = 250 g charcoal pot-1 |
| C4: 7.5% by soil weight = 375 g charcoal pot-1 |
Where soil weight = 5 kg soil of pot.
