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.