Analysis of Resource Productivity and the Level of Fertilizer - Manure Substitution Among Vegetable Farmers in the Southern Region of Nigeria. Mediterranean Journal of Social Sciences, [S. l.], v. 3, n. 2, p. 35, 2012. Disponível em: https://www.richtmann.org/journal/index.php/mjss/article/view/10999.. Acesso em: 18 jun. 2024.