The Evening star (Oenothera biennis L.) is being commonly named as “the king that cures everything” and represented an important element in folk medicine after 1916, after having been sent to Europe. The experiments have been set up in Câmpia Banatului, inTimiş County more precisely (U.S.A.M.V.B. territory in Timişoara) on a cambic chernozem type of soil and in Bihor county, more precisely in Depresiunea Beiuşului, on a clay loam soil type. Researches have been carried out during 2011-2012, in two sowing periods: the third decade of March and the third decade of October, and with three levels of fertilization with organic manure i.e. N 50 , N 100 , N 150 . The purpose of the research was to determine the content in oil, the oil production and the content of the two unsaturated fatty acids, in organic culture. The oil content was negatively influenced by organic fertilizers, these increased oil production by 46 kg/ha at the doses level of N 50 and by 50.5 kg/ha at the doses level of N 150. At the variant fertilized with N 50 there was an oil production increase by 47% and 46 kg/ha respectively. By increasing the dose of nitrogen at N 150 , the increase in oil production was of 52%, production rose by 50,5 kg/ha. The sample with the highest content of linoleic and oleic acid was the N 100 (60.28% respectively 10.72%).

Oil content, oil production, oleic and linoleic acids.

Presentation: oral