lmmature state of rubber tree takes 5
to 7 years depending on varieties, climate
condition, soil properties and fertilizer
management. The growth rates of rubber tree
grown in the South and the East region of
Thailand are higher than those grown in the
North-East and the North. The average trunk
girth increment of an immature plant grown
in the South and the East region was 8.10-8.50 cm yeail whereas, only 5.70-7.30 cm
year-1 of trunk girth increment in the latter
regions