ريس عراك ر. 2017. Response of some vegetative growth ponitars maize zea mays l. To spray potasium and zinc: RANA .R.ARRAK. Journal of Kerbala for Agricultural Sciences. 4, 1 (Mar. 2017), 74–87. DOI:https://doi.org/10.59658/jkas.v4i1.84.