Nitrogen nutrition of cowpeas (Vigna unguiculata) effects of timing of inorganic nitrogen applications on nodulation, plant growth and seed yield. Tropical Agriculture, [S. l.], v. 58, n. 1, 1981. Disponível em: https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/2821.. Acesso em: 15 jul. 2024.