Shiraz University Iran Agricultural Research 1013-9885 1 1 1982 03 21 Growth and nitrogen content of sunflower as affected by the rate and form of nitrogen اثر میزان و نوع ازت بر روی رشد و مقدار ازت آفتابگردان 61 72 4587 10.22099/iar.1982.4587 EN M. Maftoon M. Darbeheshti J. Yasrebi A. Sameni Journal Article 2017 12 25 https://iar.shirazu.ac.ir/article_4587_273d1119da7b2ff483e10dfbe1d11d3b.pdf