Alterações físicas em um solo fertirrigado com água residuária de suinocultura

Abstract

The objective of this study was to verify the physical changes generated by the swine effluent used in fertigation in an exploited area under tillage technique. These areas were soil samples collected in layers of 0,00- 0,20 me 0,20-0,40m deep for determination of saturated hydraulic conductivity, macroporosity, microporosity, total porosity, bulk density, particle density, conductivity electric saturated extract and infiltration rate. We also determined the values of N, P2O5, K2O, Ca and Mg the wastewater used in fertigation. The experimental design was completely randomized (DIC) in split plot with three replications. The data were submitted to analysis of variance, and when statistical differences were submitted to the mean test of 5% type Tuckey. Under the conditions of this experiment fertigation with swine wastewater there were no changes in the studied physical attributes, but differences were observed in the attributes due to the use and occupation of land, after ten years of fertigation application; total porosity and macroporosity were higher in the forest area, which also showed a lower bulk density. Although soil salinization not present, the electrical conductivity of the wastewater showed high value, which can lead to salinization of soil and grouwndwater contamination.