Qualidade do solo mediante aplicação de efluente de piscicultura

Abstract

The use of fish farming effluents to irrigate agricultural crops is a promising alternative for the more efficient use of water used in mainland pisciculture. In addition to contributing to the supply of water for crops, they can improve soil fertility by reducing fertilizer spending. The objective of this study was to verify that the application of effluent from fish farming affects soil quality. The experiment was installed in vegetable and tilapia production, located in Beberibe (CE). Characterization of well water as well as effluent produced in fish culture tanks were carried out. Soil characterization of the area of the seedbeds was also carried out. The experiment was conducted in a randomized complete block design. The first treatment factor consisted of three irrigation waters: T1 = well water; T2 = 100% effluent; T3 = 50% effluent + 50% well water. The second treatment factor consisted of two forms of nutrient supply: With fertilization and Without fertilization. At the end of the experiment, soil samples were collected in which fertility indicators, as well as salinity indicators, were evaluated, in addition to the nitrogen content. We performed data analysis of variance and Tukey test for comparison of rate. The fish farming effluent and the poultry litter improve chemical attributes of the soil. The irrigation with the effluent from fish farming can be considered a viable alternative for the semi-arid conditions, and can be used as a type of fertirrigation. However, inadequate irrigation management, combined with the use of this effluent, can lead to salinization of the soil, and there is a need for constant monitoring.