Produção de fitomassa e teor de óleo essencial de folhas de alecrim-pimenta (Lippia sidoides Cham.) em diferentes espaçamentos de plantio

Abstract

Produção de fitomassa e teor de óleo essencial de folhas de alecrim-pimenta (Lippia) is a shrubby medicinal plant with aromatic leaves and essential oil rich in thymol and carvacrol. These components have great importance to the species since they present scientifically proven pharmacological activities. Thus, the study of cultivation conditions for this species is essential to obtain higher productivity. Spacing between plants is one of the most important factors related to cultivation, since crop productivity and yield are affected by plant density. Based on the need of optimizing pepper-rosmarin cultivation techniques, this work aimed to evaluate the phytomass production and the essential oil yield in four planting spacings. The experiment was carried out under field conditions in the Agricultural Sciences Institute, Federal University of Minas Gerais (ICA/UFMG), Montes Claros Municipality, Minas Gerais State, Brazil. Experimental design was in randomized blocks, with four treatments and five replicates. Treatments consisted of the planting spacings 1.0 x 0.5 m; 1.0 x 1.0 m; 1.5 x 1.0 m; and double rows (1.0 x 0.8 x 0.5 m), with 1.0m between double rows, 0.8m between single rows and 0.5m between plants in the row. After 150 days of planting in the field, leaf fresh and dry phytomass production and essential oil yield were evaluated. The spacing 1.0 x 0.5 m led to higher phytomass production and essential oil yield, being therefore the most recommended for pepper-rosmarin cultivation.

Teor e composição química do óleo essencial e crescimento vegetativo de Aloysia triphylla em diferentes espaçamentos e épocas de colheita

“…O conhecimento prévio das condições de cultivo é de fundamental importância para estimular o aumento da produção dos componentes dos óleos essenciais (Lima et al, 2003) e, dessa forma, obter óleos essenciais com alta qualidade e melhores valores de mercado (Melo et al, 2011). Marco et al (2007) constataram que capim-citronela, na altura de corte de 15 cm e em densidades menores (0,80 x 0,80 m), tem produção de óleo essencial maior (40,02 mL/ kg de massa seca) do que em densidades maiores de plantas (0,50 x 0,50 m).…”

Growing of tropical black sage and chemical composition of the essential oil

“…As averages followed by a capital letter in the column and lowercase in the row, they do not differ from each other by the Tukey test (p ≤ 0.05). Melo et al (2011) observed the highest average value for pepper-rosmarin oil yield in the lowest spacing used (1.0 × 0.5 m). Marco et al (2006), working with lemon grass (Cymbopogon winterianus J.…”

Organic fertilization affecting pests and production of Lippia sidoides Cham. (Verbenacea)

“…Then samples of fresh material were used to determine the level of essential oil, by hydrodistillation, using Clevenger equipment (Figueiredo et al, 2009;Melo et al, 2011). The aerial part was fragmented, weighed, the sample of approximately 100 g of the plant, placed in a glass flask with distilled water (Figueiredo et al, 2009;Melo et al, 2011).…”

“…The extraction process was conducted for four hours. After this period of time, the product resulting from the extraction was submitted to a drying process in a forced air circulation chamber for the determination of the dry matter sample (60ºC, to constant weight) (Figueiredo et al, 2009;Melo et al, 2011). The content of essential oil was estimated based on the dry material (g of oil 100g…”