Hartikainen, Helinä. “Effect of Cumulative Fertilizer Dressings on the Phosphorus Status of Mineral Soils II Comparison of Two Phosphorus Testing Methods”. Agricultural and Food Science 61, no. 2 (March 1, 1989): 61–66. Accessed December 23, 2024. https://journal.fi/afs/article/view/72353.