Table 2.
Elemental contents of biochar and organic manure.
| Total C | Total N | CN | P | K+ | Ca2+ | Mg2+ | Na+ | pH (CaCl2) | Ash | Volatile matter | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| g kg−1 | g kg−1 | g kg−1 | g kg−1 | g kg−1 | g kg−1 | g kg−1 | % | % | |||
| Rice husk biochar | 424.0 | 6.0 | 70.7 | 0.86 | 0.98 | 1.57 | 0.95 | 0.28 | 9.1 | 45.2 | 23.2 |
| Corn cob biochar | 683.6 | 8.8 | 77.7 | 1.41 | 3.30 | 3.51 | 1.15 | 0.43 | 10.3 | 18.5 | 19.6 |
| Cattle manure1 | 166.9 | 13.1 | 12.8 | 3.75 | 6.53 | 7.84 | 8.93 | nd | nd | nd | nd |
| 54.9 | 3.4 | 0.78 | 2.16 | 1.47 | 1.33 |
1Means ± SD (in italics) over all crops which received manure (n = 11).
2Biochar was applied in a single initial addition; Manure was applied for each crop (except one) over two years.