YILDIZ, NESRIN, NURAY BILGIN, and KENAN BARIK. “Determination of Plant Available Nitrogen of Erzurum Plain Soils”. Asian Journal of Chemistry 20, no. 4 (March 30, 2010): 3049–3056. Accessed November 29, 2024. https://asianpubs.org/index.php/ajchem/article/view/12678.