Tree growth is an important factor for early good yield, as only possible for a tree which grows vigorously when young (Simmonds, 1989). Further, the growth during the initial years is crucial for Hevea especially with respect to the attainment of tappable girth (Sethuraj and George, 1980; Paardekooper, 1989). The growth of trees in term of girth from eighth to tenth years of planting and mean annual girth increment is depicted in Table 2.