Kaila, Armi, and Anha-Meri Pohjanpää. “Observations on the Effect of „Fertosan“- and „QR“- Preparations Upon the Humification of Straw”. Agricultural and Food Science 24, no. 2 (May 1, 1952): 86–92. Accessed August 24, 2024. https://journal.fi/afs/article/view/71319.