Caracterização físico-química de solos de pisciculturas do município de Dourados – MS

Abstract

Soil quality is essential when used for aquaculture production, it must be resistant to physicalchemical and organic changes, which may occur due to cultivation of aquatic organisms. The objective of this work was to characterize physically and chemically the soil and verify the amount of organic matter in seven properties in the city of DouradosMS, and relate how these parameters influence the aquatic ecosystem. Soil samples were collected from March to May 2021 in seven fish farms in the city of Dourados, MS. The samples were taken from the free edge slopes, with no contact between the soil and water. In the physical analysis, for the granulometric composition of the samples, the amount (g Kg-1) of sand, silt and clay in each sample was verified, using the textural triangle to analyze the percentage of soil composition and the textural class. Descriptive statistical analysis of the data was performed and subjected to Pearson correlation analysis, with pH data, organic matter MO, effective cation exchange capacity t, potential cation exchange capacity T, base saturation V% and saturation by aluminum m%. To compare the parameters, analysis of variance (ANOVA) was used. Mean statistical differences were compared using the Tukey test. And for statistical analysis, the Statistica 7.0 software was used. The evaluated soils presented a greater amount of clay (471.33 ± 155.61 g Kg-1), in relation to silt and sand. In property P4 there was less sand, diverging from clay in a greater amount, in P6 there was more sand and less clay as a result. Base saturation (V) is generally high, with a mean of 60.47 ± 15.40%. Aluminum saturation averaged 3.24 ± 4.13% Potential CTC is high on average at 22.51 (cmolc dm-3). Soil pH was considerably acidic. In general, there was variation in particle size, chemical parameters and organic matter between the soils of the properties evaluated, however it is considered pertinent to build nurseries, and it is recommended that before the construction of nurseries, laboratory analysis is performed to verify these factors in order to have a better subsidy for decision-making at the time of construction and during aquaculture production.