Table 2.
Changes of soil nutrients in sugarcane at different growth stages.
| Seedling | Tillering | Elongation | Maturity | |
|---|---|---|---|---|
| pH | 6.22 ± 0.04 a | 5.83 ± 0.05 b | 5.55 ± 0.06 c | 5.38 ± 0.09 c |
| OM/(g kg−1) | 26.78 ± 0.89 ab | 25.03 ± 0.54 b | 30.80 ± 1.91 a | 26.71 ± 1.19 ab |
| TN/(g kg−1) | 2.74 ± 0.04 a | 2.45 ± 0.02 b | 2.39 ± 0.03 b | 2.40 ± 0.02 b |
| TP/(g kg−1) | 0.80 ± 0.01 b | 0.78 ± 0.01 b | 0.92 ± 0.02 a | 0.82 ± 0.01 b |
| TK/(g kg−1) | 23.25 ± 0.20 a | 16.58 ± 0.44 c | 19.65 ± 0.24 b | 17.18 ± 0.28 c |
| AN/(mg kg−1) | 182.06 ± 5.73 a | 168.75 ± 3.12 a | 127.01 ± 1.67 b | 125.04 ± 3.46 b |
| AP/(mg kg−1) | 78.61 ± 1.87 ab | 82.08 ± 1.19 a | 65.47 ± 1.48 c | 75.46 ± 2.39 b |
| AK/(mg kg−1) | 155.99 ± 4.08 a | 149.97 ± 3.49 ab | 136.11 ± 5.70 ab | 125.11 ± 14.72 b |
| C:N | 9.84 ± 0.35 b | 10.23 ± 0.27 b | 12.89 ± 0.80 a | 11.15 ± 0.52 ab |
| Tem | 24.49 ± 0.04 b | 30.36 ± 0.06 a | 30.22 ± 0.04 a | 19.37 ± 0.03 c |
Note: Organic Matter (OM), total nitrogen (TN), total phosphorus (TP), total potassium (TK), available nitrogen (AN), available phosphorus (AP) and available potassium (AK). C:N, the ratio of soil total nitrogen to organic matter. Tem: soil temperature. Different letters in each column indicate significant differences among the stages at FDR adjusted p < 0.05.