Elonen, Paavo, and Osmo Kara. “Sprinkler Irrigation on Clay Soils in Southern Finland IV. The Effect of Repeated Applications of Water and Nitrogen Fertilization on Spring Cereals”. Agricultural and Food Science 44, no. 3 (September 1, 1972): 149–163. Accessed November 22, 2024. https://journal.fi/afs/article/view/71820.