Karer, Jasmin, Bernhard Wimmer, Franz Zehetner, Stefanie Kloss, and Gerhard Soja. “Biochar Application to Temperate Soils: Effects on Nutrient Uptake and Crop Yield under Field Conditions”. Agricultural and Food Science 22, no. 4 (December 18, 2013): 390–403. Accessed April 26, 2024. https://journal.fi/afs/article/view/8155.