روﺷﻬﺎی اﺳﺘﻌﻤﺎل ﮐﻮد زﯾﺴﺘﯽ ﻧﯿﺘﺮوژﻧﻪ ﺑﺮ ﻋﻤﻠﮑﺮد و اﺟﺰای ﻋﻤﻠﮑﺮد ﮔﯿﺎه داروﯾﯽ ﻫﻤﯿﺸﻪ ﺑﻬﺎر

Effect of nitrogen biofertilizer application on yield and yield components of calendula (Calendula officinalis L.)