No. Factor Code Details
1 Diameter of tree A1 < 10 cm  
A2 10 to 20 cm
A3 > 20 cm
2 Tapping height from Ground Level B1 < 40 cm
B2 40 to 80 cm
B3 > 80 cm
3 Treating with H2SO4 C1 0 %
C2 40 %
C3 60 %
Table 1: Details of treatments.