Influence of sugarcane variety and management on the mineral composition of vinasse from alembic cachaca

Vinasse is the main waste of the productive activity of fermentative processes for ethanol and cachaca production due to the large volume generated, but little is known about the composition of vinasse from alembic cachaca. The present study evaluated the influence of the sugarcane variety (RB867515, RB966928 and RB855453) and management (conventional and organic) on the mineral composition of vinasse from alembic cachaca in a randomized block design with four parcels. Vinasse samples were evaluated for pH and concentrations of carbon, nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, copper, manganese and zinc and carbon/ntrogen ratio. There was a significant effect of management only on three elements of the vinasse composition, C, K and Mg. Regarding the variety, there was a significant effect only on Ca and Mg concentrations in the varieties RB867515 and RB855453. The sugarcane variety and management had little influence on the composition of vinasse from alembic cachaca. The average concentration of macro-and micronutrients of the vinasse samples indicates that it can be used in fertigation due to the rich composition in macro-and micronutrients when compared to the cachaca or ethanol vinasse compositions reported in literature, especially N, P, K, Ca, Mg, S, Fe and Cu.