List of Articles Hamdollah Kazemi Arbat Article 1 - The effect of plant density and nitrogen fertilizer on leaf area, chlorophyll, and grain protein of Zea mays in competition with Amaranthus retroflexus 20.1001.1.21558221.2021.11.3.7.8 10.30495/ijpp.2021.682917 Mojtaba Fateh Hamdollah Kazemi Arbat Soleyman Mohammadi Farhad Farahvash Eskandar Zand Iranian Journal of Plant Physiology , Issue 2 , Year , Summer 2021