Espa?amento entre linhas e horários de colheita na produ??o de biomassa e teor de óleo essencial de hortel? (Mentha arvensis L.)

摘要

The peppermint is a plant grown primarily for essential oil production and biomass, which can be influenced by environmental conditions. This study aimed to evaluate the biomass production and essential oil content of mint (Menthaarvensis L. ) under the effect of different row spacing of planting and harvesting schedules. The experiment was conducted in a randomized block design with three replications and six treatments in a 2x3 factorial, two row spacings (0,40 x 0,30 m and 0,60 x 0,30 m) and three harvest time (6:00 to 7:00, 10:00 to 11:00 and 16:00 to 17:00). The characteristics evaluated were: total chlorophyll, temperature of leaves in harvest time(°C), total fresh biomass of leaves ( t ha -1 ), total dry biomass of leaves ( t ha -1 ), total fresh biomass of shoot ( t ha -1 ), total dry biomass of shoot ( t ha -1 ) and essential oil content based on dry biomass of leaves (% óleo). The 0,40 x 0,30 m spacing was superior for the production of fresh biomass of leaves and shoots (3,05 and 4,8 t ha-1, respectively) and dry biomass of leaves and shoots (0,28 and 0,5 t ha-1, respectively). There was no effect on the timing of harvest or spacing on essential oil yield. Key-words: Mentha arvensis L . , planting density, oil yield