Avaliação do rendimento de etanol de batata-doce produzida com diferentes fontes e doses de potássio

Abstract

Sweetpotato has significant biomass production to obtain biofuel, making it an attractive source of bioenergy. Given these aspects, the objective of the present study was to evaluate the effects of different potassium sources on sweet potato cultivars aiming at ethanol production. The experiment was carried out at the São João Irrigated Fruit Pole, in the city of Porto Nacional-TO. The design was a split-plot, composed of three sweet potato cultivars (Duda, Amanda and Beatriz), eight doses. Potassium and three repetitions. Potassium doses were defined as follows: Test-absolut (1) with conventional fertilizer recommended for sweet potato cultivation; use of conventional fertilizer associated with Remineralizer (rock dust) in increasing doses KCl + REM (2, 3, 4) where REM I represents half dose, REM II dose, REM III double dose; applying only the Remineralizer (rock powder) in increasing doses (5, 6, 7) and the use of KCL and the Remineralizer at the recommended dose without the addition of other fertilizers (8). Such doses are compatible with the technical recommendations for the planted crop (sweet potato). After applying the doses of K the sweet potato cultivars were planted. From the results obtained under the experimental conditions, it can be concluded that the use of soil Remineralizer (biotite-schist) in sweet potato cultivars shows positive effects on ethanol production. The use of Remineralizer positively influences the productivity of the evaluated cultivars. The dry matter and starch content increase when combined with the conventional source (KCL) with the Remineralizer.