Field study was conducted to evaluate plant density as well as planting time on the vegetative and reproductive traits of Tareh Irani. The experiment was a factorial one designed in the framework completely randomized blocks of three replications at the research farm of Agricultural Faculty of Tehran University in 2003. Plant density consisted of 7 levels (133, 200, 266, 400, 533, 800 and 1600 plant per experiment unit), while planting time of two levels (5 April and 5 September). Results indicated that yield of biomass decreases with increasing plant density, the density of 1600 plants per m2 yielding the lowest. Maximum seed production, seed biomass, and biomass yields were obtained from the densities of 133 and 200 plants per m2. Although crop yield was high in high-density treatments but it did not show any significance with others. Spring cultivated plants produced more flowering stalks and seeds. The weight of a thousand seeds and the amounts of Ca, Mg, K, P, Na, protein, lipid, TSS, and vitamin C were not affected by planting density.
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