Effect of N- fertilizer and plant density on growth, development, herb yield and active substance of feverfew (Tanacetum parthenium Cv.Zardband) medicinal plant

The objective of this study was to investigate the effect of two N-fertilizer rates and plant density on herb yield and active substance of feverfew (Tanacetum parthenium Cv.Zardband). The experiment was performed in a factorial trial, RCB design. Three rates of N-fertilizer (0.75 and 150 kg/ha) and plant densities of 10 and 20 cm were applied as treatments, with three replications. After performing soil analysis of experimental site seedlings were transferred from nursery to the main plots. Plants were harvested 5 cm from ground, when they reached 60% full-bloom, then air dried in laboratory. Dried samples constituents were characterized and quantified by means of water distillation extraction and GC/MS. The results of Duncan multiple range test showed that, there is a very significant (P