S. Abaka, A. J., and M. H. S. Al-Asady. “Effect of Variety and Spraying of Humic Acid on Growth and Produc-Tivity of Silk Corn (Zea Mays L.) and it‘s Content of Some Active Com-Pounds to the Date of Harvesting”. Journal of Kerbala for Agricultural Sciences, vol. 4, no. 4, Dec. 2017, pp. 19-30, doi:10.59658/jkas.v4i4.113.