Rodrigues, Antônio Carlos da Gama, and Antônio Cadima Zevallos. “Root Number As a Parameter for Evaluating <i>Brachiaria humidicola< i> Root System in the ‘Tabuleiro’ Soils of Southern Bahia, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 26, no. 7, July 1991, pp. 1091-5, doi:10.1590/S1678-3921.pab1991.v26.3443.