Hermógenes Bezerra Maia, Érika Mirelly Santana de Queiroz, Renata Akemi Shinozaki-Mendes and Ramom Rachide Nunes
Most Brazilian soils are known to present a low natural fertility. This problem is most evident in the Brazilian Backwoods, mainly due to their edaphoclimatic conditions. In opposition to the agriculture challenges, on the other hand, activities of fish farming have been growing in Brazil. However, aquaculture is an activity that generates effluents with a high amount of organic matter (OM) and nutrients. In a dual perspective, to solve the problem of the low soil fertility and the toxic potential of the effluents generated in the fish farming, the implementation of integrated farming systems could be an interesting alternative, proposing to reuse the water from fishponds by enhancing OM and recycling nutrients via irrigation. Thus, the present work aims to carry out a chemical study of water from fishponds for use in irrigation of plants of economic interest. The soil collected and characterized in this study was a dystrophic Red-Yellow Argisol (dRYA). Samples of FFW and the dRYA was characterized and its physical/chemical attributes determined. According to the results, chemical characteristics allow the FFW the in the irrigation of plants with economic interest. Since dRYA is low in OM (2.12%), TOC (0.43%) and %V (47%), soil samples showed a non-natural fertility at a level of considerable profitability. Thus, according to our findings (about FFW and dRYA chemical characterization), it is possible to consider the use of water from fish farming in the soil/plant irrigation. At future, agronomic assays will be carried out in order to evaluate the real effects of the FFW irrigation in an organicagroecological farm, in a family nucleus system of production, in the Brazilian Backwoods.
Fish Farming Water, Brazilian Backwoods, Organic Matter, Organic Agriculture