Tsimba, R., C. Curt, B. Kevin, S. James, S. Maheswaran, E. Greg, R. Densley, and W. Ian. “Recovery of Soil Nitrogen by Maize at Various Soil Depths: A Field Study Using 15N-Labelled Fertiliser Nitrogen”. Journal of New Zealand Grasslands, vol. 88, Oct. 2026, pp. 177-84, doi:10.33584/jnzg.2026.88.3880.