Effect of biological phosphate and chemical phosphorus fertilizer on yield quality and quantity of Ajowan (Carum Copticum) medicinal plant

In order to study the effect of biological phosphate and chemical phosphorus fertilizer on yield quality and quantity of Ajowan (Carum copticum) medicinal plant, an experiment was conducted as factorial experiment in the base of randomized complete blocks design and three replications at research farm of Khorramabad in Lorestan of Iran in 2013. Treatments included biological phosphate (Pseudomonas putida) at two levels inoculated and non-inoculated and chemical phosphorus (P2O5) at three levels (Zero, 50 and 100 kg.ha-1). Results showed that effect of treatments on grain yield, biological yield, harvest index (HI) and essential oil yield were statically meaningful, however, there were no significant differences between treatments in about essential oil percentage. The means showed that the greatest plant highest (70 cm), biological yield (1798 kg.ha-1), grain yield (475 kg.ha-1) and essential oil yield (17.25 kg.ha-1) were obtained by a treatment of biological phosphate + chemical phosphorus (50 kg.ha-1 P2O5). In general, results of the present study revealed that application of biological fertilizers plays a remarkable role in improving quantity and quality of Ajowan and they can be viewed as a suitable replacement for chemical fertilizers