KÖLLER, Karlheinz. Trends bei Saat und Mineraldüngung. agricultural engineering.eu, [S. l.], v. 58, n. 6, p. 358–359, 2003. DOI: 10.15150/lt.2003.1528. Disponível em: https://www.agricultural-engineering.eu/landtechnik/article/view/2003-58-6-358-359. Acesso em: 29 apr. 2024.