Aboutalebian,M , and Baba Raeisi,A . "Effect of zinc sulfate application method on maximum leaf area index, yield and yield components of sunflower (Helianthus annuus L.) under water stress conditions", Iranian Journal of Field Crop Science, 48, 2, 2017, 339-350. doi: 10.22059/ijfcs.2017.125338.653877