In order to understand the effect of organic fertilizer on yield of anise, an
experiment was conducted in the form of split-plot in randomized complete
block design with three replications in Mashhad, Khorasan Agriculture and
Natural Resource Research Center. Four treatments of fertilization: the
control, vermicompost - 5 t/ha, cow manure - 25 t/ha, and mineral fertilizer
(NPK) - 60 kg/ha (the same rate of each nutrient) were applied as the main
factor. The second factor was plant density, applied at three levels: 17, 25,
and 50 plants/m2. The results showed a significant effect of fertilizer on
the number of umbels per plant, number of umbellets per umbel and canopy
cover. Plant density had a significant effect on grain yield, biological
yield, the number of lateral branches, essential oil percentage and yield of
essential oil. Seed and essential oil yield were the highest in the case of
the application of vermicompost and plant densities of 50 and 25 plants/m2
respectively.