Effects of biological and chemical fertilizers on quantity yield of saffron (Crocus sativus L.) in different planting densities

In order to evaluate the effects of biological and chemical fertilizer application and plant density on yield of saffron، an experiment was conducted in Alashtar county during year of 2013. In this experiment were evaluated two densities (4 and 5 corms t. ha-1) and 4 fertilixers including control، Nitroxin biofertilizer، NPK and Nitroxin biofertilizer+ NPK as split plot based on a randomized complete block design. Results indicated that density had significant effect on number of flower and dried weight of stigma and flower. Increasing in density from 4 to 5 t. ha-1 corms improved number of flowe، dried flower weight، dried stigma weight up to 48، 87 and 82%، respectively. The maximum dry weight of stigma (over 30 kg. ha-1) was observed in 5 ton corms. ha-1. Also، the effect of fertilizer was significant on number of flowers، dry weight of flowers، stigma and corm yield of saffron (p≤0. 05). The highest number of flower، dry weight، dry weight stigma of saffron (more than three g. m-2) were related to Nitroxinbiofertilizer+ NPK. The maximum dry weight of flower and stigma yield was observed in 5 ton corms. ha-1. Overal، application biofertilizer and NPK increased quantitative yield of saffron. Nitroxin inoculation could be reducing consumption of chemical fertilizers، which is a move towards sustainable agriculture and decline environmental pollutions.