The aim of this study was to evaluate the effectiveness of a bio fertilizer enriched in N (NPKB) and a bio protector (NPKP) with the addition of fungi chitosan from C. elegans on the characteristics and nutrient uptake by melon (Cucumis melo) grown in an Argi soil from Southwestern Bahia, Brazil. The bio fertilizers with NPKB and NPKP were compared with the mineral soluble fertilizer (NPKF) and the earthworm compound (which was not enriched in N by diazo trophic bacteria) to verify the possibility of their use as an alternative for conventional NPK soluble fertilizer.