Effect of biological phosphate and chemical phosphorus fertilizer on yield and yield components of Ajowan (Carum Copticum)

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 plant height, umbel number per plant, grain number per umbel and grain yield were statically meaningful, however, there were no significant differences between treatments in about weight of 1000 grains. The means showed that the greatest plant highest (70 cm) and grain yield (475 kg.ha-1) were obtained by a treatment of biological phosphate + chemical phosphorus (50 kg.ha-1 P2O5). Results indicate that applying the combined biological phosphate and chemical phosphorus fertilizer can be practical and helpful method to increase Ajowan yield, yield components and reduce the environmental pollution.