Abstract

QUESADA MENDEZ, Isaac; ARISTIZABAL GUTIERREZ, Fabio Ancízar; MONTOYA CASTANO, Dolly  and  CHAVES CORDOBA, Bernardo. Assessment of six tapping systems for four Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg.,clones in the Colombian High Plains. Colomb. for. [online]. 2009, vol.12, n.1, pp.37-49. ISSN 0120-0739.

The rubber yield of four Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg. clones was evaluated on the Colombian high plains in the Meta department: IAN 873 and RRIM 600 (third year of tapping being done) and PB 260 and GT 1 (first year of tapping). Six tapping systems were used, including a combination of different tapping frequencies (d/4 and d/5), Ethephon concentrations (0%, 2.5%, 3.3% and 5%) and a number of applications per year (4 to 8) were also used depending on the clone. The production figures for one commercial year were obtained from assays, using a completely random- block design (having four repetitions) independently defined for each clone: having on average 4446 g rubber/tree of produce per year for the RRIM 600 clone within a system ½S, d/4, 6d/7, 10m/12, ET 2.5%, Pa 7/y; 2696 g rubber/tree for the PB 260 clone with ½S, d/4, 6d/7, 10m/12, ET 2.5%, Pa 5/y; 3822 g rubber/tree for the IAN 873 clone, ½S, d/4, 6d/7, 10m/12, ET 3.3%, Pa 8/y, and 3472 g rubber/ tree for the GT 1 clone, ½S, d/4, 6d/7, 10m/12, ET 2.5%, Pa 5/y. The highest produce was obtained with a four-day tapping frequency.

Keywords : Hevea brasiliensis; tapping; Ethephon; yield; natural rubber.

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