Table 1.

Basic properties of the soil used in this study.

Soil Sample	K+ (mg/g)	Mg2+ (mg/g)	P (mg/g)	N (mg/g)	Si (mg/g)
S1	0.029 ± 0.007	0.006 ± 0.001	0.022 ± 0.002	5.366 ± 0.223	0.099 ± 0.007
S2	0.009 ± 0.002	0.044 ± 0.005	0.016 ± 0.004	3.805 ± 0.346	0.04 ± 0.012
S3	0.004 ± 0.002	0.056 ± 0.012	0.012 ± 0.006	5.476 ± 0.478	0.042 ± 0.005

S1: forest soil, S2: fertilized rubber tree rhizosphere soil from a rubber tree plantation, S3: fertilized bare soil from a plantation.