Effects of bio and chemical fertilizers on yield and yield components of cumin (Cuminum cyminum L.)

In order to study the effects of biological and chemical fertilizers on yield and yield components of cumin (Cuminum cyminum L.), an experiment was conducted in Shahed University in 2011.The factors included biological phosphorus at two levels (inoculated and non-inoculated), chemical phosphorus at three levels (0, 40, 80 kg.ha-1 P2O5 from triple super phosphate), biological nitrogen with trade name Nitroxin (inoculated and non- inoculated), and chemical nitrogen at three levels (0, 25, 50 kg.ha-1 N from urea). Experimental treatments were arranged in a RCBD in a factorial arrangement with three replications. In this experiment, number of umbels per plant, number of seeds per umbel, 1000 seeds weight, plant height, seed yield, biological yield, harvest index (HI), essential oil percentage and essential oil yield were measured. According to the obtained results, significant differences were found among fertilizer treatments for number of umbels per plant, number of seeds per umbel, biological yield, seed yield, harvest index (HI), and essential oil yield (p<0.01). Results showed that the maximum number of umbels per plant (29.73 number), number of seeds per umbel (11.1 number), biological yield (245 g.m-2), seed yield (101.3 g.m-2), harvest index (47.22%) and essential oil yield (2.96 g.m-2) were obtained by applying 40 kg/ha-1 triple super phosphate, biological phosphorus, 25 kg.ha-1 N and biological nitrogen. The minimum values were recorded for control group.