Figure 2 Environmental variables in dry and rainy seasons between two locations of rubber tree soils. The significant differences between seasons and locations were detected by two-way ANOVA. WC: Water content, SOM: Soil organic matter, pH: Soil pH, AN: Ammonium nitrogen, NN: Nitrate nitrogen AP: Available phosphorus, AK: Available potassium, TN: Total nitrogen, TP: Total phosphorus, TK: Total potassium. *, P < 0.05; **, P < 0.01, ***, P < 0.001