ﺑﺮرﺳﯽ ﺗﺎﺛﯿﺮ ﺗﻘﺴﯿﻂ ﻧﯿﺘﺮوژن و ﮐﺎرﺑﺮد اﺳﯿﺪ ﻫﯿﻮﻣﯿﮏ ﺑﺮ ﻋﻤﻠﮑﺮد و اﺟﺰای ﻋﻤﻠﮑﺮد ذرت در رﻗﺎﺑﺖ ﺑﺎ ﻋﻠﻒ ﻫﺎی ﻫﺮز

Effect of split application of nitrogen and humic acid on yield and yield components of maize in competition with weeds