KÖLLER, Karlheinz. Trends bei Saat und Mineraldüngung. agricultural engineering.eu, [S. l.], v. 60, n. 6, p. 312–313, 2005. DOI: 10.15150/lt.2005.1248. Disponível em: http://195.37.233.11/landtechnik/article/view/2005-60-6-312-313. Acesso em: 7 mai. 2024.