GRIEPENTROG, Hans-Werner. Teilflächenspezifische Düngung. agricultural engineering.eu, [S. l.], v. 52, n. 1, p. 12–13, 1997. DOI: 10.15150/lt.1997.2573. Disponível em: http://195.37.233.21/landtechnik/article/view/1997-52-1-012-013. Acesso em: 22 feb. 2025.