Answer and Explanation:
Title: Biological Nitrogen Fixation by Legumes and N Uptake by Coffee Plants
Author: Medonça et Al.
Publication information: The article was published in the Revista Brasileira de Ciencia do solo, in Minas Gerais, in 2017, but I had access to the article translated into English by a scientific research portal called Scielo.
My research question was about alternatives for nitrogen fixation in plants, without using chemical fertilizers.
This article managed to show me that there is a biological nitrogen fixation process, which uses soil bacteria. The article presented an experiment that proved the efficiency of these bacteria, mainly in coffee plants.