Shepherd, Mark A, and Bill T Carlson. “Urine Patch Size and Nitrogen Load: Effects on Nitrogen Uptake from the Urine Patch in Plantain and ryegrass/White Clover Pastures”. Journal of New Zealand Grasslands 80 (December 4, 2018): 195–200. Accessed June 22, 2026. https://www.nzgajournal.org.nz/index.php/JoNZG/article/view/321.