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    Rubber tapping system effect on the productivity of Hevea brasiliensis in the Colombian Middle Magdalena

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    P谩ginas 184-192.Los sistemas de sangr铆a con estimulaci贸n se usan para minimizar costos y aumentar la producci贸n de l谩tex. Por ello, se evaluaron sistemas de sangr铆a con diferentes frecuencias con y sin estimulaci贸n con Ethrel脪 y niveles de fertilizaci贸n en un cultivo del FX3864 de Hevea brasiliensis de 9 a帽os de edad en Barrancabermeja, Santander. El estudio se realiz贸 con un dise帽o de parcelas divididas distribuido en bloques al azar, considerando como parcela principal los sistemas de sangr铆a con diferentes frecuencias con y sin estimulaci贸n y como subparcela los tratamientos de fertilizaci贸n con dosis combinadas de N, P y K. La producci贸n de caucho seco, consumo de corteza, incidencia de seca fisiol贸gica, contenido de caucho seco y la rentabilidad econ贸mica se consideraron como variables de respuesta. La producci贸n m谩s alta se obtuv贸 con los sistemas d/3 E y d/4 E (1.446 y 1.281 kg ha-1 a帽o-1, respectivamente), con diferencias significativas con los sistemas d/3 S.E y d/5 E. Entre los tratamientos de fertilizaci贸n no se encontr贸 diferencias significativas, aunque la mayor producci贸n se obtuvieron con los niveles 40-40-40 kg ha-1 y 80-80-80 kg ha-1 de N, P y K. En cuanto a los mayores niveles foliares de N, P, K y Ca se encontraron en el sistema d/4 E. Con estos resultados se recomienda el sistema de sangr铆a d/4 E por tener la mejor rentabilidad econ贸mica bajo diferentes rendimientos del sangrador, menor consumo de corteza (3,86 cm), mayor vida 煤til de la plantaci贸n (3,85 a帽os) y menor incidencia de enfermedades de panel.ABSTRACT: Tapping systems with stimulation are used to minimize costs and improve latex yield. For this, tapping systems with different frequencies and with or without Ethrel庐 stimulation and fertilizer levels were evaluated in a 9-yearold crop of FX3864 of Hevea brasiliensis in Barrancabermeja, Santander. In this study, a split plot design with randomized complete blocks was used, where the tapping systems with different frequencies with or without stimulation were considered as the principal plot and the fertilization treatments with combined dosages of N, P and K were considered as the subplots. The dry rubber yield, bark consumption, tapping panel dryness incidence, dry rubber content and profitability were considered as response variables. The systems d/3 E and d/4 E obtained the highest yield (1,446 and 1,281 kg ha-1 yr-1, respectively), with significant differences with the systems d/3 S.E and d/5 E. For the fertilization treatments, there were no significant differences. Notwithstanding, the highest yields were obtained in the 40-40-40 kg ha-1 and 80-80-80 kg ha-1 of N, P and K balanced treatments. The higher foliar levels of N, P, K and Ca were founded in the d/4 E system. According to these results, the d/4 E tapping system is recommended to be the most profitable under different tapping yields, with less bark consumption (3.86 cm), longer life plantation (3.85 years) and less disease panel incidence.Bibliograf铆a: p谩gina 192.Art铆culo revisado por pares
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