Application of organic matters is one of the most important strategies for plant nutrition compared to chemical fertilizers, especially in organic management of medicinal plants. Isabgol (Plantago ovata L.) is an effective ingredient to lower cholesterol and reduce the risk of heart disease. In order to study the impact of different vermicompost (VC) levels on biological and seed yield and mucilage content of isabgol, a field experiment was conducted based on randomized completed block design with three replications, at Agricultural Research Station, College of Agriculture, Ferdowsi University of Mashhad, during growing season of 2011-2012. Treatments included four levels of VC (zero (VC0), 2 (VC2), 4 (VC4) and 6 (C6) t.ha-1). Studied characteristics of isabgol were number of spike per plant, biological yield, seed yield, and mucilage content. The results indicated that the effects of different levels of VC were significant (p≤0.05) on all studied traits of isabgol. With increasing in VC level enhanced number o spike per plant, biological yield, seed yield, and mucilage content of isabgol. The highest and the lowest number of spike were observed in VC6 and VC0 with 10.7 and 8.5 spikes.plant-1, respectively. With increasing in VC level from zero to 6 t.ha-1 improved mucilage content up to 30%.

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