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The aim of this study was to evaluate fresh and dry mass, as well as essential oil yield, in Lippia sidoides cultivated in the north of Minas Gerais State, Brazil. The experimental design was in randomized blocks, with five treatments and four replicates. Treatments consisted of the following harvesting intervals: 120, 180, 240, 300 and 360 days after transplanting. Measurements on each harvesting included plant height, stem base diameter, leaf, stem and shoot fresh matter yield, and shoot dry matter yield, besides essential oil content and yield per plant. The highest essential oil content was detected at 180 days, whereas the highest dry matter production was observed at 390 days. Essential oil yield per plant was 2.34±1.15 g and productivity was 124.8 kg ha-1. Thus, harvesting at 180 days is recommended. O objetivo do estudo foi avaliar a massa fresca, massa seca e rendimento de óleo essencial de Lippia sidoides cultivada no Norte de Minas. O delineamento foi em blocos ao acaso, com quatro tratamentos e cinco repetições. Os tratamentos foram constituídos por intervalos de colheita: 120, 180, 240, 300 e 360 dias após o transplantio. Em cada colheita, foram determinados a altura das plantas, o diâmetro da base do caule, o rendimento de matéria fresca de folhas, caule, parte aérea e o rendimento de matéria seca da parte aérea, além do teor e rendimento de óleo essencial por planta. O teor máximo de óleo essencial foi detectado aos 180 dias, enquanto que a produção máxima de matéria seca ocorreu aos 329 dias. A produção de óleo essencial por planta foi 2,34±1,15 g. A produtividade de óleo essencial foi de 124,8 kg ha-1, sendo recomendada a colheita aos 180 dias

Effect of harvesting time on phytomass production and essential oil yield in "alecrim-pimenta" (Lippia sidoides Cham.)