Acúmulo de massa, teor foliar de nutrientes e rendimento de óleo essencial de hortelã-do-campo (Hyptis marrubioides EPL.) cultivado sob adubação orgânica

Abstract

The Hyptis type (Lamiaceae) includes around 300 species of large occurrence in tropical America. This type presents a great importance as a source of bioactive constituents and has important biological effects. Because of the demand growth in medical plants consume, agricultural practices, the fertilization in special, have been studied in order to increase its productivity. The study was conducted from September 2004 to January 2005. The aim of this study was to evaluate the effect of organic fertilization in the plant growth, foliar content of nutrients and yield of the essential oil in Hyptis marrubioides plants. It was evaluated 5 doses of farmyard manure (0,3, 6, 9 e 12 kg m-2) combined with absence and presence of 1,8 t ha-1 of dolomitic limestone. The organic fertilization provided an improvement on soil fertility, increase of dry biomass and bigger yield of essential oil (g plant-1). The liming didn't significantly influenced the analyzed variables.