SIPPOLA, J. Estimation of soil nitrate in the spring as a basis for adjustment of nitrogen fertiliser rates. Agricultural and Food Science, [S. l.], v. 9, n. 1, p. 71–77, 2000. DOI: 10.23986/afsci.5648. Disponível em: https://journal.fi/afs/article/view/5648. Acesso em: 19 jul. 2024.