KETTUNEN, L.; HEIKKILÄ, T.; JAAKKOLA, A. Fertilizer effect and a model for forecasting yields . Agricultural and Food Science, [S. l.], v. 53, n. 1, p. 42–51, 1981. DOI: 10.23986/afsci.72054. Disponível em: https://journal.fi/afs/article/view/72054. Acesso em: 26 may. 2024.