title: Effect of different liming levels on the biomass production and essential oil extraction yield of Cunila galioides Benth.
abstract: Poejo is an aromatic and medicinal plant native to highland areas of south Brazil, in acid soils with high Al3+ concentration. The main objective of the present work was to evaluate the effect of liming on the extraction yield of essential oil of three chemotypes of poejo (Cunila galioides Benth). For this purpose, the experiments were performed in a greenhouse, using 8-litre pots. The treatments were four dosages of limestone (0, 3.15, 12.5, and 25 g.L(-1)) and a completely random experimental design was used, with four replications and three chemotypes, set up in a 3 × 4 factorial arrangement. The parameters evaluated were dry weight of aerial parts, essential oil content and chemical composition of essential oil. Results showed that liming affects the biomass production, essential oil yield and chemical composition, with cross interaction verified between chemotype and limestone dosage. For the higher dosage lower biomass production, lower yield of essential oil as well as the lowest content of citral (citral chemotype) and limonene (menthene chemotype) was observed. In the ocimene chemotype, no liming influence was observed on the essential oil yield and on the content of major compounds. The dosage of 3.15 g.L(-1) can be considered the best limestone dosage for the production of poejo for the experimental conditions evaluated.
authors.affiliation: Departamento de Ciências Agrárias, Universidade Regional Integrada do Alto Uruguai e das Missões - URI, Av. 7 de setembro, 1621, CEP 99700-000, Erechim, RS, Brazil.
authors.forename: A J
authors.initials: AJ
authors.lastname: Mossi
authors.forename: G F
authors.initials: GF
authors.lastname: Pauletti
authors.forename: L
authors.initials: L
authors.lastname: Rota
authors.forename: S
authors.initials: S
authors.lastname: Echeverrigaray
authors.forename: I B I
authors.initials: IB
authors.lastname: Barros
authors.forename: J V
authors.initials: JV
authors.lastname: Oliveira
authors.forename: N
authors.initials: N
authors.lastname: Paroul
authors.forename: R L
authors.initials: RL
authors.lastname: Cansian
mesh_terms: D018533:Biomass; D002119:Calcium Carbonate / Q000494:pharmacology; D019686:Lamiaceae / Q000737:chemistry* / Q000254:growth & development / Q000378:metabolism; D010938:Plant Oils / Q000737:chemistry / Q000302:isolation & purification*; D011897:Random Allocation
chemical_list: D010938:Plant Oils; D002119:Calcium Carbonate