Humic substances and its distribution in coffee crop under cover crops and weed control methods . Scientia Agricola, [S. l.], v. 73, n. 4, p. 371–378, 2016. DOI: 10.1590/0103-9016-2015-0214. Disponível em: https://revistas.usp.br/sa/article/view/117316.. Acesso em: 30 apr. 2024.