Surányi, Szilvia, and Zoltán Izsáki. 2016. “Effect of N, P and K Fertilisers and Their Interactions in a Long-Term Experiment on Winter Barley (Hordeum Vulgare L.)”. Acta Agraria Debreceniensis, no. 70 (October): 87-92. https://doi.org/10.34101/actaagrar/70/1823.