Biofertilizers are considered as an alternative approach instead of chemical fertilizers that improve soil fertility and plant growth. In order to study the effects of biofertilizers and mother corm weights on availability of soil phosphorus and potassium nutrients under saffron cultivation as planting beds, an experiment was conducted as factorial based on a complete block design with three replications at Research Greenhouse, College of Agriculture, University of Birjand during 2014. Three fertilizers such as humic acid, Yaramila complex (specific fertilizer for saffron) and control (without fertilizer) and three corm weight included 4-6, 7-9 and 10-12 g were considered as experimental treatments. The results showed that the simple effect of different fertilizers was significant (p

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