[en] In order to evaluate the effects of different organic and biological fertilizers on quantity and quality of fennel essentialoil, an experiment was conducted in a completely randomized block design with three replications. The experimentaltreatments included two organic (compost and vermicompost) and two biological (Pseudomonas putida and Azotobacterchroococcum) fertilizers, their all twin combinations (Ps. putida + A. chroococcum, Ps. putida + compost, Ps. putida + vermicompost, A. chroococcum + compost, A. chroococcum + vermicompost and compost + vermicompost) and control (non fertilized). There were significant differences between treatments in terms of seed essential oil percentage, essential oil yield; anethole, fenchone, limonene and stragole content in seed essential oil. Results showed that the highest and the lowest percentages of essential oil were obtained in control (2.9%) and A. chroococcum + vermicompost (2.2%) treatments, respectively. The highest essential oil yield (29.9 L ha–1) and anethole content of essential oil (69.7%) and the lowest contents of fenchone (6.14%), limonene (4.84%) and estragole (2.78%) in essential oil were obtained in compost + vermicompost treatment. It seems that compost + vermicompost treatment compared to other treatments supplied the highest equilibrium of nutrients and water in the root zone of sweet fennel which is led to increasing the anethole content, there upon, decreasing other compounds. Essential oil yield and percentage of anethole content in essential oil were significantly higher in all organic and biological treatments compared with control.

[es] Con el fin de evaluar los efectos de diferentes fertilizantes org&aacute;nicos y biol&oacute;gicos sobre la cantidad y calidad del aceite esencial de hinojo, se realiz&oacute; un experimento en un dise&ntilde;o aleatorizado de bloques completos con tres repeticiones. Los tratamientos experimentales incluyeron todas las combinaciones dobles de dos fertilizantes org&aacute;nicos ydos biol&oacute;gicos (Pseudomonas putida + Azotobacter chroococcum, Ps. putida + compost, Ps. putida + humus de lombriz, A. chroococcum + compost, A. chroococcum + humus de lombriz, y compost + humus de lombriz) y un control(sin fertilizar). Hubo diferencias significativas entre tratamientos en t&eacute;rminos de porcentaje del aceite esencial de las semillas, rendimiento de aceite esencial y contenido en anetol, fenchone, limoneno y estragol en el aceite esencial.Los resultados mostraron que el mayor y el menor porcentaje de aceites esenciales se obtuvieron en los tratamientos control (2,9%) y A. chroococcum + humus de lombriz (2,2%), respectivamente. En el tratamiento compost + humus de lombriz se obtuvo la mayor producci&oacute;n de aceite esencial&nbsp;(29,9 L ha&ndash;1) y contenido en anetol (69,7%), as&iacute; como elmenor contenido de fenchone (6,14%), limoneno (4,84%) y estragol (2,78%). Parece que el tratamiento de compost + humus de lombriz suministr&oacute; el mayor equilibrio de nutrientes y agua en la zona de la ra&iacute;z del hinojo en comparaci&oacute;n con otros tratamientos, lo que aumenta el contenido de anetol, y por tanto disminuye el de otros compuestos. La producci&oacute;n de aceite esencial y el porcentaje de contenido en anetol en el aceite esencial fue significativamente mayor en todos los tratamientos org&aacute;nicos y biol&oacute;gicos que en el control.