Nitrogen fertilisation represents a high cost for small producers who do not have sufficient subsidies to invest in their crops and thus obtain higher crop yields and profitability. This cost can be reduced by biological nitrogen fixation through the cultivation of leguminous soil cover crops. The aim was to evaluate vetch genotypes associated with different strains of nitrogen-fixing bacteria, seeking satisfactory results within the reach of producers. The whole experiment shows a series of advantages and ways of contributing to agriculture and the environment, generating production with reduced impact.