Table 2.
Experimental treatments for determining the effect of Biochar, T. diversifolia green manure and Urea on soil aggregate distribution and C content in a maize field in western Kenya.
| Treatment | Biochar |
Green manure (T. diversifolia) |
Mineral N fertilizer (Urea) |
|||
|---|---|---|---|---|---|---|
| Rate (t ha−1)a |
Code | Rate (t ha−1)b |
Code | Rate (kg N ha−1)c |
Code | |
| 1 (B0T0U0)(Control) | 0.0 | B0 | 0.0 | T0 | 0.0 | U0 |
| 2 (B0T2.5U0) | 0.0 | B0 | 2.5 | T2.5 | 0.0 | U0 |
| 3 (B0T5U0) | 0.0 | B0 | 5.0 | T5 | 0.0 | U0 |
| 4 (B0T0U120) | 0.0 | B0 | 0.0 | T0 | 120 | U120 |
| 5 (B0T2.5U120) | 0.0 | B0 | 2.5 | T2.5 | 120 | U120 |
| 6 (B0T5U120) | 0.0 | B0 | 5.0 | T5 | 120 | U120 |
| 7 (B2.5T0U0) | 2.5 | B2.5 | 0.0 | T0 | 0.0 | U0 |
| 8 (B2.5T2.5U0) | 2.5 | B2.5 | 2.5 | T2.5 | 0.0 | U0 |
| 9 (B2.5T5U0) | 2.5 | B2.5 | 5.0 | T5 | 0.0 | U0 |
| 10 (B2.5T0U120) | 2.5 | B2.5 | 0.0 | T0 | 120 | U120 |
| 11 (B2.5T2.5U120) | 2.5 | B2.5 | 2.5 | T2.5 | 120 | U120 |
| 12 (B2.5T5U120) | 2.5 | B2.5 | 5.0 | T5 | 120 | U120 |
a
One kg of biochar per treated plot.
b
1 and 2 kg of T. diversifolia, respectively. Biochar C = 86.8%, T. diversifolia C ∼48%.
c
100 g per treated plot.