SAARELA, I., H. HUHTA, and P. VIRKAJÄRVI. “Effects of Repeated Phosphorus Fertilisation on Field Crops in Finland 2.Sufficient Phosphorus Application Rates on Silty and Sandy Soils”. Agricultural and Food Science 15, no. 4 (January 4, 2006): 423–443. Accessed May 10, 2024. https://journal.fi/afs/article/view/5853.