Evaluation of wood volume increment in Quassia amara L. - Simaroubaceae, under agroecological cultivation in the humid tropic of Costa Rica

Abstract

Quassia amara is a 3-6m tall bush which has been indiscriminately removed from forests for extraction of quassins from its stem. These substances have been used in pharmaceutical industry and as insecticide in organic agriculture. There is not much technical information about the growth of this species to subsidize sustainable management strategies. The aim of this study was to evaluate the growth of Quessia amara under agroecological cultivation in Costa Rica. The study consisted in evaluating the development of Q. amara individuals in permanent plots intercropped with other tree species. Stem diameter at 10 cm from the ground and total height were measured. According to the results concerning growth rates, Mean Annual Increment (MAI) and Current Annual Increment (CAI), even at five years after planting, Q. amara wood is not ready to be harvested.