Effect of applied fertilization on productivity and quality of spinach (Spinacia oleracea). Bulgarian Journal of Soil Science, Agrochemistry and Ecology, [S. l.], v. 55, n. 3-4, p. 35–44, 2021. Disponível em: https://agriacad.eu/ojs/index.php/bjssae/article/view/1587.. Acesso em: 18 aug. 2026.