Produção de massa e rendimento de óleo essencial do orégano (Origanum Vulgare L.) em função de diferentes lâminas de irrigação

Abstract

The purpose of this experiment was to analyze the effect of five level of irrigation water depth replacement on the production of fresh and dry weight for aerial parts and roots; net profit, water use efficiency, content and yield of oregano essential oil. The water depth had been based on the class A pan evaporation (ECA) as is: 0% ECA (no irrigation); 25% ECA; 50% ECA; 75% ECA and 100% ECA. The experiment was installed in President Prudente-SP in the periods: experiment 1 (02/24 to the 05/24/2006) and experiment 2 (07/13 to the 10/14/2006). The work was divided in two articles. Article 1 - Oregano production with different water depths replacement using class A pan evaporation, which had a linear and positive relation with the water depth increment, for the fresh and dry weight for aerial parts and roots. The 100% ECA replacement water depth has presented the maximum productivity (8089.70 kg ha-1), and also the maximum annual net profit (R$ 72,085.79). In the Article 2 - Content and yield of essential oil in oregano (Origanum vulgare L.) influenced by different irrigation depths, it was observed that the fresh weight production (MFPA), the content and the yield of oregano essential oil had been influenced by the irrigation depth, with the biggest values to the experiment 1 found in the treatment with 100% ECA. On the experiment 2, only the fresh weight production has been influenced by the treatments. Therefore, the oregano has the production of biomass and essential oil favored by humid environments, being indicated the use of the 100% ECA irrigation depth.