Avaliação do substrato orgânico de açaí (Euterpe oleracea) na produção de mudas de coentro em sistema de aquaponia.

Abstract

The use of aquaponics systems has grown together with the demand for sustainable technologies. This study proposes the reuse of agro-industrial residues (açaí production chain) and evaluated the performance of coriander seedlings in an organic substrate of açaí kernels in an aquaponic system. The experiment was carried out at the Federal Rural University of Amazônia, campus Belem in a greenhouse-type protected environment. The aquaponic system consisted of a tambaqui growing tank and five floating germination benches with Coriander variety of the “Verdão” type. The substrates used in the experiment were composed by the incorporation of the açaí kernel to the commercial substrate of coconut fiber and corresponded to five treatments with three replications: (T1) 0%, (T2) 25%, (T3) 50%, (T4) 75% and (T5) 100%. During the experiment, the water quality parameters related to temperature (28.01 ± 0.54°C), hydrogen potential (7.10 ± 0.23), dissolved oxygen (7.25 ± 0.96 mg/L -1) and electrical conductivity (60.78 ± 10.19 μS/cm) remained within the range indicated for tambaqui cultivation and for plants. The incorporation of açaí kernel to the coconut fiber substrate affects the development of coriander seedlings, with the best results obtained at the concentration of 25%, the others provided negative effects mainly related to the number of leaves and stem diameter. The fish showed good zootechnical performance with 98.72g of weight gain and final biomass of 7.89 kg/m3. The Glucose and Hematocrit parameters observed in this work suggest that the physiological stress of tambaqui did not occur in the aquaponic system. The açaí seed can be reused to produce coriander seedlings in concentrations of up to 25% with the commercial substrate of coconut fiber.