The rubber will open the slit when the cycle is measured from the ground up at 150 cm. circumference 50 centimeters or more, regardless of the age of the tires and the open slit at the height from ground: 150 cm.
The rubber is tapped when measured from the area around 150 cm above the ground has a circumference of 50 cm or more, regardless of the age of rubber trees and planting at a height of 150 cm.
Rubber trees are cut open when measured around the stem the higher from the ground 150 cm, circumference 50 centimeters above, regardless of the age of the rubber tree. Tapping point and high from the ground 150 cm