A comparative analysis of yield and yield components of 6 medicinal plants species under Varamin's climate condition

Varamin region with its dry subtropical climate is well known for being the most suitable site for the production of medicinal herbs. This study was undertaken to investigate some morphologic traits, yield and yield components of 6 medicinal plants species in a randomized complete blocks design with six treatments (species) and three replications. The 5 traits recorded during growing season were as follows: Dry biomass, hay and stands per plot (7.5 m2), earliness (days to maturity), and grain yield (kg/ha). Analysis of variance and F test of data showed the highest yield in Sesame (3512 kg/ha) and the lowest in Coriandrum, and Foeniculum (451 kg/ha). Foeniculum was the only herb that produced higher yield in the second year. In regard to maturity Coriandrum with 146 days was the longest and Foeniculum with 100 days was the earliest maturity. In order to overcome heterogeneity at harvested plants numbers, the covariance analysis was employed on some characters such as dry biomass weight per plot, and yield. The results demonstrated respectively 152.69 %, and 210.56 % relative efficiency to the analysis of variance.