Methods used in legume-rhizobium studies to improve biological nitrogen fixation in Africa

analytical methods arbre biological development crecimiento croissance cultivation cultivo date de semis fecha de siembra feed crops fixation de l'azote grain legumes growth inoculation inoculation methods isolation techniques legumes leguminosas leguminosas de grano nitrogen fixation plantas forrajeras plantation planting pratique culturale rhizobium seed semence semillas soil sol sowing date suelo technique analytique technique de l'isolement trees