257 Talaei et al. Int. J. Biosci. 2014 RESEARCH PAPER OPEN ACCESS Effects of biological fertilizers on quantitative and qualitative yield of cumin medicinal plant (Cuminum cyminum L.) Ghasem Hosein Talaei 1* , Majid Amini Dehaghi 2 , Behzad Shokati 3 1 Young Researchers and Elite Club, Khorramabad Branch, Islamic Azad University, Khorramabad, Iran 2 Department of Agronomy and Plant Breeding, Faculty of Agriculture, Shahed University, Iran 3 Young Researchers and Elite Club, Shabestar Branch, Islamic Azad University, Shabestar, Iran Key words: Biological yield, Cumin, essential oil, medicinal plants, yield. http://dx.doi.org/10.12692/ijb/4.11.257-264 Article published on June 11, 2014 Abstract With the aim of investigate the effects of biological fertilizers on quantitative and qualitative yield of cumin an experiment was conducted during 2010 in the reseach farm od medicinal plants research center of Shahed university, Tehran, Iran. Experiment was arranged as a factorial based on randomized complete block design in three replications. Treatmes included biological nitroxin, biological phosphorous, biological nitroxin+ phosphorous and control treatment. The results showed that effect of treatments on umble number per plant, grain number per umble, grain number per plant, biological yield, grain yield, harvest index and essential oil yield were statically meaningful. However, there were no significant diffrences between treatments in terms of plant height, 1000 grain weight and essential oil percentage. In among studied treatments maximum values were observed at biological nitroxin + phosphorous treatment and nitroxin and phosphorous biofertilizer treatments were in second and third order respectively compared with control. The highest grain yield was observed in nitroxin + phosphorous bioferitilizer (68.79 g.m 2 ) and the lowest grian yield was belonging to control treatment (48.96 g.m 2 ). Maximum and minimum essential oil were obtained from nitrixin+phosphorous biofertilizers (1.92 g.m 2 ) and control treatment (1.45 g.m 2 ) respectively. It could be suggested that biological fertilizers could be proposed as a superseded of chemical fertilizers in sustainable agriculture. * Corresponding Author: Ghasem Hosein Talaei  Ghasem.talaei@gmail.com International Journal of Biosciences | IJB | ISSN: 2220-6655 (Print) 2222-5234 (Online) http://www.innspub.net Vol. 4, No. 11, p. 257-264, 2014