Table 1 Chemical properties of soils from tea orchards with different continuous cropping years
Chemical properties | 0 year | 1 year | 10 years | 20 years |
|---|---|---|---|---|
pH | 4.88a | 4.17b | 3.89c | 3.86c |
SOC (g kg-1) | 2.59c | 16.58a | 15.16 a | 12.76b |
AN (mg kg-1) | 52.50c | 126.70a | 106.87b | 107.33b |
AP (mg kg-1) | 5.00d | 61.50a | 25.00b | 8.67c |
AK (mg kg-1) | 43.64a | 26.84b | 10.02c | 26.84b |
TN (g kg-1) | 0.29b | 1.46a | 0.15c | 0.22b |
TP (g kg-1) | 1.70c | 6.32a | 3.37b | 4.23b |
TK (g kg-1) | 3.31b | 3.31b | 4.18a | 4.12a |
EAl3+ (cmol(1/3Al3+) kg–1) | 2.32c | 4.84b | 8.03a | 5.06b |
EH+ (cmol(H+) kg–1) | 0.41c | 0.91b | 1.47a | 1.21a |
EH++EAl3+ (cmol kg–1) | 2.7.3c | 5.75b | 9.51a | 6.27b |
CEC (cmol kg–1) | 4.36c | 8.22ab | 9.77a | 7.03b |