A Note on the Fertilizer Ratio Concept. The Pakistan Development Review, [S. l.], v. 17, n. 1, p. pp.123–130, 1978. DOI: 10.30541/v17i1pp.123-130. Disponível em: https://thepdr.pk/index.php/pdr/article/view/479. Acesso em: 26 oct. 2025.