اثرﺗﻨﻈﯿﻢ ﮐﻨﻨﺪه ﻫﺎی رﺷﺪ ﮔﯿﺎﻫﯽ ﺑﺮ ﺑﺮﺧﯽ ﺻﻔﺎت روﯾﺸﯽ ﮔﯿﺎﻫﭽﻪ ﻫﺎی آﻓﺘﺎﺑﮕﺮدان در ﺷﺮاﯾﻂ ﺳﺮﻣﺎ

Effect of plant growth regulators on vegetative characteristics of sunflower seedling (Helianthus annuus L) in cold condition