Rubber (BPM24 clone) growth planted in double row spacing (4mx3mx16m) up to 18 months is comparable to that planted in normal spacing 6.7m x 3m (Fig. 1). The gap of rubber girth between those two treatments increased afterward and started to be significant at 24 months. The presence of P. falcataria at different densities reduced rubber growth significantly since 24 months. At 51 months, rubber girth at intercropped plot was 30% and 15% less than that at monoculture normal spacing and at monoculture double row spacing respectively.