اﺛﺮ زﻣﺎن ﺑﺮداﺷﺖ ﺑﺮ ﻋﻤﻠﮑﺮد داﻧﻪ و ﺑﺮﺧﯽ ﺻﻔﺎت زراﻋﯽ ﭼﻬﺎر رﻗﻢ ﮐﻠﺰا در ﻣﻨﻄﻘﻪ رﺷﺖ و آﻣل

Effect of harvesting time on grain yield and some agronomical traits of four rapeseed cultivarsin Rasht and Amol area