THIESSEN, Eiko. Sensorgesteuerte Stickstoffdüngung. agricultural-engineering.eu, [S. l.], v. 55, n. 2, p. 144–145, 2000. DOI: 10.15150/lt.2000.1863. Disponível em: https://www.agricultural-engineering.eu/landtechnik/article/view/2000-55-2-144-145. Acesso em: 29 märz. 2024.