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: https://www.agricultural-engineering.eu/landtechnik/article/view/1997-52-1-012-013. Acesso em: 29 märz. 2024.