Addition rate (g kg−1) | Soil pH (1:5 with H2O) | Total nitrogen (g kg−1) | Organic matter (g kg−1) | Negative charge of soil (cmolc kg−1) | C/N ratio | Available phosphorus (mg kg−1) | Exchangeable cation (cmolc kg−1) | |||
---|---|---|---|---|---|---|---|---|---|---|
Ca | K | Mg | Na | |||||||
0 | 6.82a | 1.05d | 11.5d | 6.85d | 11.0a | 142a | 4.70d | 0.44d | 0.95d | 0.37c |
10 | 4.44c | 2.54c | 25.2c | 7.43c | 9.92b | 140a | 5.03c | 0.81c | 1.17c | 0.42bc |
20 | 4.55c | 5.18b | 51.5b | 8.70b | 9.94b | 137a | 5.61b | 1.29b | 1.51b | 0.46ab |
40 | 6.35b | 9.50a | 97.9a | 11.4a | 10.3b | 144a | 6.14a | 2.10a | 2.09a | 0.53a |