Eficiência do uso de diferentes corretivos da acidez do solo e a influência destes nos atributos químicos da água doce

Abstract

This study aimed to evaluate the efficiency of using different types of soil acidity correctives and their influence on the chemical parameters of fresh water used in fish aquaculture. A completely randomized design (CRD) was used, consisting of 4 treatments with 5 replications, totaling 20 experimental units (polyethylene boxes). The treatments tested were: T1- treatment with soil without addition of corrective (Control); T2- treatment with soil corrected with agricultural shell limestone (commercial); T3- treatment with soil corrected with eggshell powder and T4 – treatment with soil corrected with Lithothamnium (calcareous algae). An acidic soil with a high aluminum content was used as substrate, which was corrected with the correctives tested, and new chemical determinations were carried out after its incubation period. The corrected soils were placed in plastic boxes and covered with fresh water for 15 days, and samples of the water were collected at the end to determine the chemical attributes: pH, hardness, alkalinity and aluminum. The collected data were submitted to analysis of variance (ANOVA) and means compared by Tukey's test (p<0.01). The results obtained with the eggshell powder corrector (T3) showed results similar to those of agricultural shell limestone (T2). However Lithothamnium (T4) stood out from the other correctives, presenting the best results in the correction of soil acidity and on the chemical parameters of water quality.