TABLE 1.
Soil physiochemical properties in the bulk and rhizosphere soils of soybean.
| Treatments | pH | SOC (g⋅kg–1) | TN (g⋅kg–1) | NH4+ (mg⋅kg–1) | NO3– (mg⋅kg–1) | AP (mg⋅kg–1) | AK (mg⋅kg–1) | |
| Bulk | CK | 8.19 ± 0.02a | 9.95 ± 2.04c | 0.98 ± 0.02b | 3.96 ± 0.47ab | 1.85 ± 0.53a | 13.92 ± 0.79b | 159.87 ± 16.10c |
| CS | 8.17 ± 0.04a | 12.36 ± 1.71b | 0.99 ± 0.03b | 3.99 ± 0.26ab | 1.95 ± 0.39a | 16.19 ± 0.78a | 199.47 ± 19.17b | |
| LB | 8.17 ± 0.03a | 12.85 ± 1.56b | 1.01 ± 0.01b | 4.07 ± 0.59ab | 1.76 ± 0.45a | 16.21 ± 0.64a | 167.83 ± 9.62bc | |
| HB | 8.20 ± 0.02a | 15.25 ± 1.42a | 1.07 ± 0.02a | 3.43 ± 0.31b | 1.75 ± 0.58a | 16.58 ± 0.68a | 279.63 ± 14.63a | |
| BCF | 8.15 ± 0.03a | 12.75 ± 0.67b | 1.00 ± 0.05b | 4.45 ± 0.47a | 2.06 ± 0.37a | 17.05 ± 0.55a | 154.73 ± 17.45c | |
| Rhizosphere | CK | 8.16 ± 0.03A | 10.04 ± 2.08C | 1.02 ± 0.01B | 3.87 ± 0.37AB | 1.95 ± 0.63A | 14.12 ± 0.89B | 156.77 ± 15.10C |
| CS | 8.15 ± 0.05A | 12.49 ± 1.81B | 1.04 ± 0.03B | 3.84 ± 0.20AB | 2.04 ± 0.79A | 16.69 ± 0.88A | 195.87 ± 16.17B | |
| LB | 8.17 ± 0.02A | 12.93 ± 1.26B | 1.03 ± 0.02B | 3.97 ± 0.69AB | 1.86 ± 0.65A | 16.71 ± 0.74A | 165.63 ± 9.62BC | |
| HB | 8.18 ± 0.02A | 15.33 ± 1.92A | 1.12 ± 0.02A | 3.26 ± 0.31B | 1.89 ± 0.55A | 16.68 ± 0.78A | 272.13 ± 16.63A | |
| BCF | 8.13 ± 0.01A | 12.82 ± 0.67B | 1.02 ± 0.07B | 4.34 ± 0.67A | 2.21 ± 0.47A | 17.23 ± 0.75A | 149.23 ± 19.45C |
Different letters within the same column indicate significant differences between the treatments (p < 0.05), lowercase letters for the bulk soil and uppercase letters for the rhizosphere. CK, control; CS, wheat straw addition; LB, low biochar addition; HB, high biochar addition; BCF, biochar compound fertilizer. SOC, soil organic carbon; TN, total nitrogen; AP, available phosphorus; AK, available potassium.