Coriander (Coriandrum sativum) is an annual medicinal plant that its seeds and leaves have many food, pharmaceutical and cosmetics applications [6]. Therefore, study the agronomical aspects of this plant is so important. It was reported that plant nutrition management has significant effects on quantitative and qualitative indices of coriander. In order to study the effects of single and combined application of organic, biological and chemical fertilizers on quantitative and qualitative characteristics of Coriander, an experiment was conducted based on a Completely Randomized Block Design with three replications and 12 treatments at Research Station, Faculty of Agriculture, Ferdowsi University of Mashhad, Iran, in year 2011. Treatments included : 1- mycorrhiza (Glomus intraradices), 2- biosulfur (Thiobacillus sp.), 3- chemical fertilizer (NPK), 4- cow manure, 5- vermicompost, 6- mycorrhiza + chemical fertilizer, 7- mycorrhiza + cow manure, 8- mycorrhiza + vermicompost, 9- biosulfur + chemical fertilizer, 10- biosulfur + cow manure, 11- biosulfur + vermicompost and 12- control. Results showed that the highest number of umbel per plant (19) and number of umbelest per umbel (5) were observed in mycorrhiza treatment. These results are accordance with the results of Kapoor et al. [5]. The highest number of seed per umbel (22), number of seed per plant (366), seed yield (1468 kg/ha) and harvest index (55%) were obtained in mycorrhiza + chemical fertilizer treatment. It was reported that mycorrhiza improves growth indices and yield of plant by penetrating in the micro pores of soil and increasing root absorption area [1, 2, 3]. Combined application of biosulfur with chemical fertilizer had a noticeable effect on 100-seed weights and biological yield indices. The highest essential oil percentage and essential oil yield were observed in mycorrhiza and mycorrhiza with chemical fertilizer treatments, respectively (0.2% and 2602 g/ha). Overall, results of this experiment showed that application of biological fertilizer especially mycorrhiza had a significant effect on improving of quantitative and qualitative seed yield of Coriander. Furthermore, the combined application of mycorrhiza with organic and chemical fertilizer had better effects than their single application. It has been reported that combined application of nutritional sources increase plant growth through increasing of soil nutritional balance [4].

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