comparison the effect of organic and chemical fertilizers on yield and essential oil percentage of basil (ocimum basilicum l.)

in order to have a sustainable agriculture it is necessary to use environmental friendly inputs to improve ecological aspects of environment. basil (ocimum basilicum l.) is a medicinal and vegetable crop which is cultivated in different parts of the world. an experiment was conducted at research station, faculty of agriculture, ferdowsi university of mashhad, iran, in year 2009. a complete randomized block design with six treatments, and three replications was used. the treatments were: control (no fertilizer), cow manure, sheep manure, hen manure, vermin-compost and npk fertilizers. results showed that all studied organic manures were high in measured characters in compare with chemical fertilizer. the highest plant height, leaf yield, fresh and dry matter were obtained at vermicompost. treatments have no significant affect on essential oil percentage. the highest essential oil yield was obtained in cow manure treatments. third cut and the first cut had the maximum and the minimum of leaf yield, fresh and dry shoot yield, respectively. essential oil percentage in the first cut was significantly more than other cuts, but essential oil yield, were the highest in third cut because this cut produced highest leaf yield. there was no significant difference between chemical fertilizers and control treatment in all characters except green area index and fresh and dry leaf weight in a plant.