Kristó, István, and Szabolcs Varga. “Change of NPK-Supply of Soil in Békés County Between 2005 and 2009”. Review on Agriculture and Rural Development 2, no. 1 (January 1, 2013): 331–335. Accessed December 20, 2024. https://iskolakultura.hu/index.php/rard/article/view/13331.