Virgin bark tapping of RRIC 100, RRIC 101 and RRIC 103 [Hevea brasiliensis]
1983
Waidyanatha, U.P. de S. | Samaranayake, C. | Soyza, A.G.A. de | Perera, M.C.
All three clones, RRIC 100, 101 and 103 responded with substantial yield increases when the tapping intensity was increased, after the third year of tapping, from 1/2 S d/3 to 1/2 S d/2; RRIC 103 gave the highest and sustained yields with 1/2 S 2d/3 tapping. The girth increment and incidence of brown bast were not adversely affected by the increased tapping intensities. There was no advantage with any of the clones in tapping two panels of a tree on a rotational basis, whether the rotations were d/2, d/3 or yearly, as against tapping any one panel continuously to completion. Separation of the two cuts by 106 cm compared to the conventional 53 cm was also not beneficial. RRIC 101 and 103 responded well to puncture tapping except that the incidence of brown bast was high on RRIC 103, possibly due to the extra-long (2 m) tapping band on it. The girth increment of RRIC 101 was lowest with puncture tapping. RRIC 103 also yielded well on 1/4 S d/2 tapping with ethrel stimulation
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