Abstract
Biogas is a technology that enables the generation of energy through the process of anaerobic biodigestion, and sweet potato is an option as an energy production source. This research evaluated biogas production in anaerobic biodigesters and characterized the physico-chemical composition of two commercial sweet potato cultivars, BRS Cuia and BRS Rubissol, and two genotypes, Bela Vista and Laranjeiras. Variance analysis, the Tukey test and the physical-chemical characterization were completed, and the results were correlated using principal component analysis (PCA). In the analyses of tuberous root composition, significant differences between the genotypes were observed because of the influence of the absorption of moisture, decomposition, and variations in the yield and quality of roots. For the biochemical methane potential (BMP) test, the estimate of biogas production was 2,906.5 liters ha-1 for the cultivar BRS Cuia, 2,712.4 liters ha-1 for Laranjeiras, 2,906.5 liters ha-1 for BRS Rubissol, and 398,2 liters ha-1 for Bela Vista. The PCA analysis of sweet potato genotypes, physical-chemical and agronomic parameters showed all genotypes have a direct correlation with the amount of reducing sugars and humidity, with 97.77% of the data variability explained. The Laranjeiras genotype has the most significant potential to produce biogas, followed by the BRS Cuia cultivar. The results emphasize that the sweet potato crop is a good source of biomass for energy generation.
Highlights
The sweet potato (Ipomoea batatas L.) is a herbaceous plant native to Central and South America
The sweet potato genotypes differ in many aspects, such as root structure, root shape, reserve root bark color, pulp color, flavor, texture, resistance to pests and yields (Borém, 2005)
The BRS Cuia and BRS Rubissol sweet potato cultivars developed by Embrapa Clima Temperado (Pelotas, RS) and the Bela Vista and Laranjeiras genotypes were selected for the experiment and come from the germplasm bank of the Horticulture Research Center
Summary
The sweet potato (Ipomoea batatas L.) is a herbaceous plant native to Central and South America. Biomass is a renewable source of energy that can generate heat, electricity and biofuels (McKendry, 2002). With the expansion of clean and renewable energy, the production of biofuel from the biomass of several crops has been used, since they contain high content of organic matter from the carbohydrates (sugars and starches) stored (Brasil, 2015). The sweet potato genotypes differ in many aspects, such as root structure, root shape, reserve root bark color, pulp color, flavor, texture, resistance to pests and yields (Borém, 2005). These characteristics are important in deciding which variety to use for trade and for other processing (Stathers et al, 2013)
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