KÖLLER, Karlheinz. Trends bei Saat und Mineraldüngung. agricultural engineering.eu, [S. l.], v. 62, n. 6, p. 382–383, 2007. DOI: 10.15150/lt.2007.1017. Disponível em: http://195.37.233.11/landtechnik/article/view/2007-62-6-382-383. Acesso em: 8 mai. 2024.