Evaluation of sedimentary sludge from an excavated nursery, populated with tambaquis and ducks, aiming its use in agriculture

Abstract

World aquaculture produced 122.6 million tons (2020) and Brazil 841 thousand tons (2021) of fish. Amazonas is one of the biggest producers of tambaqui. The main breeding system is the excavated nursery (VE) (60% in Brazil). The VE presents problems with good management practices, one of the disorders is the formation of sedimentary sludge (SL), aggravated when there is consortium with birds or pigs. However, LS has been used as substrate, fertilizer and soil conditioner. Thus, the LS of an VE, populated with tambaquis and ducks, was evaluated, aiming at its use in agriculture, in Manaus-AM. The analyzes revealed that the LS was classified as sandy clay, and the contents of P, Zn, Fe and MO as high, and K, Mg and Cu as medium. Thus, it is suggested the use of LS in agriculture as a substrate, fertilizer and/or soil conditioner.