List of Articles Shannons index Open Access Article Abstract Page Full-Text 1 - Evaluation of Different Nitrogen Fertilizer Sources on Relative Abundance, Density and Biomass of Weeds in Safflower (Carthamus tinctorius L.) Roya Saeeidi Bahareh Parsa Motlagh Azam Seyedi , Hossein Shekofteh Maryam Ahmadzadeh