اثر ﺗﺎرﯾﺦ و ﺗﺮاﮐﻢ ﮐﺎﺷﺖ روی ﻋﻤﻠﮑﺮد و اﺟﺰاء ﻋﻤﻠﮑﺮد آﻓﺘﺎﺑﮕﺮدان و ﺟﻤﻌﯿﺖ ﻋﻠﻒ ﻫﺎی ﻫﺮز در ﻣﻨﻄﻘﻪ ﺗﺒﺮﯾز

Effect of planting date and plant density on yield and yield components of sunflower and weed populations in Tabriz region