List of Articles قیاق Open Access Article Abstract Page Full-Text 1 - Allelopathic effects of medicinal plant madder (Rubia tinctorum) on germination characteristics and seedling growth of sorghum (Sorghum bicolor), corn (Zea mays), field bindweed (Convolvolus arvense) and Johnsongrass (Sorghum halepense) Ruhollah NADERI Abbas YAZDANI Yahya EMAM Ehsan BIJANZADEH Open Access Article Abstract Page Full-Text 2 - The effect of nitrogen application on the competitiveness of corn at different densities of Johnson grass (Sorghum halapense) A. Keivanlo mohammad Armin