Brazil is recognized worldwide for its agricultural and forestry suitability, but its low soil fertility and inadequate fertilizer production make it resort to imports, placing it among the world's largest consumers of fertilizers. In addition, we have the Amazon Region as one of the largest producers of biomass, such as Brazil's coconut and Brazil nuts, which generated a large amount of agricultural waste. These wastes have great potential for use in industry as a source of energy and their ash co-combustion product can be used as a source of nutrients for plants. Throughout history, vegetable ash has been used as an alternative source of nutrients for agriculture, but its compositional variability may limit its application. In this context, with the objective of evaluating the energetic and fertilizing potential of the biomass and ashes derived from the coconut bay endocarp and the Brazil nut pericarp and endocarp, chemical, mineralogical and morphological characterization techniques were applied. and thermal, and for comparison purposes, eucalyptus wood was also characterized immediate (ICA) and upper (UHA) and lower (LHA) heat analysis revealed that the residues of coconut and Brazil nut biomass have potential for industrial use as a source of energy and ashes, with yield between 0.23 and 6.33, have nutritional capacity for plants, because chemical and mineralogical X-ray diffraction (XRD) analyzes combined with X-ray fluorescence (XRF) and scanning electron microscopy (SEM) showed that the ashes are rich in potassium, phosphorus and calcium compounds. Thus, the use of biomass residues and their ashes represents a sustainable and economically viable alternative for the country, since primary bioenergy production competes with food supply and there is a heavy dependence on the importation of raw materials for production of fertilizers.
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