Soil application is the most common method of providing fertilizer to the crop. It acts directly on the soil and can improve its fertility, which is the ability of a soil to sustain plant growth by providing essential plant nutrients and favorable chemical, physical, and biological characteristics as a habitat for plant growth. Organic and mineral fertilizers provide essential macro and micronutrients to the soil that plants use to grow and thrive. It is always better to use organic fertilizers because bringing organic substance and beneficial microrganisms favor the development and the health of the plants. It also helps to improve poor soils and to avoid excess of salinity in the soil (which is the main problem with chemical fertilizers). Organic fertilizers gradually release elements, so that nutrients are available with a rhythm that ensures the optimal absorption by the plant, decreasing nitrogen loss by leaching. Organic fertilizers providing organic matter and useful microorganisms (PGPR) also improve physical and biological characteristics of soil (structure, water holding capacity, cation exchange capacity, buffering capacity avoiding insolubilization of nutrients) and reduced soil erosion. Global soils contain 2 to 3 times more carbon than the atmosphere. The carbon stored in the soil contributes to stabilize the climate but also to ensure food security.