Palabras clave: Hevea brasiliensis, sangria, produccion, Ethefon, caucho natural. ABSTRACT 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 depart- ment: ian 873 and rrim 600 (third year of tapping being done) and pb 260 and gt 1 (first year of tap - ping). 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) independen- tly 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 clo- ne 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.