From: Characterization of charcoal and firewood ash for use in African peri-urban agriculture
Charcoal | Firewood | SD | Probability values | CV (± %) | |||
---|---|---|---|---|---|---|---|
(mg g−1) | Ash type | City | Ash type × city | ||||
Ca–aqua regia | 131 | 120 | 26 | NS | 0.01 | NS | 16 |
Ca–H2SO4 | 70 | 66 | 36 | NS | NS | NS | 45 |
Ca–vinegar | 164 | 148 | 38 | NS | 0.02 | NS | 18 |
Ca–water | 6.4 | 7.2 | 1.6 | NS | NS | NS | 22 |
Mg–aqua regia | 16.8 | 21.6 | 6.5 | 0.01 | 0.01 | NS | 25 |
Mg–H2SO4 | 15.9 | 20.2 | 6.1 | 0.02 | 0.04 | NS | 25 |
Mg–vinegar | 14.2 | 18.7 | 7.4 | 0.04 | NS | NS | 31 |
Mg–water | 0.06 | 0.08 | 0.04 | NS | NS | NS | 34 |
K–aqua regia | 73 | 69 | 22 | NS | 0.01 | NS | 26 |
K–H2SO4 | 120 | 100 | 38 | 0.02 | < 0.01 | < 0.01 | 17 |
K–vinegar | 136 | 87 | 74 | 0.02 | 0.02 | NS | 37 |
K–water | 24 | 24 | 3 | NS | 0.05 | 0.03 | 8 |
Na–aqua regia | 3.9 | 4.2 | 2.7 | NS | < 0.01 | 0.05 | 49 |
Na–H2SO4 | 10.8 | 12.3 | 3.2 | NS | 0.01 | NS | 23 |
Na–vinegar | 10.1 | 11.5 | 4.3 | NS | < 0.01 | NS | 21 |
Na–water | 3.8 | 4.4 | 1.7 | NS | 0.01 | 0.04 | 31 |
P–aqua regia | 0.45 | 0.43 | 0.13 | NS | NS | NS | 29 |
P–H2SO4 | 0.42 | 0.38 | 0.12 | NS | NS | NS | 31 |
P–vinegar | 0.20 | 0.13 | 0.06 | < 0.01 | NS | NS | 39 |
P–water | 0.002 | 0.002 | 0.001 | NS | NS | NS | 59 |