EFFECTS OF PLANTING DENSITY ON YIELD, GROWTH, CROWN FORMS AND OTHER TREE CHARACTERISTICS IN HEVEA BRASILIENSIS MUELL.ARG.

A.P. Ng, W. Leong, P.K. Yoon
Two clones, RRIM 600 and RRIM 701, were planted at 211, 297, 399, 557, 741 and 1067 trees per hectare (t/ha) in 1964. Trees were opened in 1970 for tapping (to harvest latex).
  • Canopy closure was earlier with higher densities of planting. Once they had closed over, the canopy densities were similar. In the early years, no difference in crown shapes was observed; differences appeared after canopy closure.
  • At 12 years after planting, higher planting density resulted in smaller tree crowns, lighter branching and longer, thinner boles. However, there was negligible difference in total tree height.
  • Girths were initially similar. With different canopy closure at different times girth differences occurred; the denser planting resulted in smaller trees.
  • Latex was first harvested when trees reached 45,7 cm girth. Because of poorer growth in the denser plots, the percentage trees that was tapped at the early years was lesser for denser plots but the absolute number of trees was greater. With subsequent years, the percentage tappability of the denser plots increased with attendant further indrease in number of trees that can be harvested for latex.
  • The yield production per hectare showed that yields increased with density up to a maximum and then declined (Figure 1). Average over eight years harvesting, the maximum biological yield was 2 320 kg/ha/yr at 850 t/ha for RRIM 600 and 2 120 kg/ha/yr at 680 t/ha for RRIM 701. The conventional planting density of 400 t/ha yielded 2 020 and 2 000 kg/ha/yr for RRIM 600 and RRIM 701 respectively.
Ng, A.P., Leong, W. and Yoon, P.K. (1981). EFFECTS OF PLANTING DENSITY ON YIELD, GROWTH, CROWN FORMS AND OTHER TREE CHARACTERISTICS IN HEVEA BRASILIENSIS MUELL.ARG.. Acta Hortic. 114, 111-112
DOI: 10.17660/ActaHortic.1981.114.11
https://doi.org/10.17660/ActaHortic.1981.114.11

Acta Horticulturae