Chemical Variation in Soil Fertirrigated With Effluent

Abstract

Purpose: The aimed witch of this study was to evaluate the chemical changes in soil cultivated with Panicum maximum cv. Mombaça grass, when submitted to application of different doses of dairy effluent (ARL), with sodium as a limiting factor.   Method/design/approach: Was applied ARL in an area cultivated with Panicum maximum cv. Mombaça grass in order to provide sodium at concentrations of 75, 150, 300 and 600 Kg ha-1.  Soil samples were collected at different depths and times, having determined the active acidity (pH) and phosphorus (P), potassium (K), organic matter (MO) and cation capacity (CTC).   Results and conclusion: Regarding the initial conditions, the pH, MO and CTC of the Soil Did not show significant Variations. However, there are reductions in P concentrations and increases in K concentration. For Environmental Conservation, the application of ARL providing 600 kg ha-1 year-1 sodium may become a Recommendation for treatment and reuse of these effluents, in relation to initial conditions, soil pH, MO and CTC did not show significant variations. However, there were reductions in P concentrations and increases in K concentration. For environmental conservation, the application of ARL providing 600 Kg ha-1 year-1 sodium may become a recommendation for treatment and reuse of these effluents.   Research implications: In the relevant literature, a technical recommendation that restricts the application of effluents providing 150 kg ha-1 sodium, in halophyte cultures, has been used interchangeably, making it difficult to use this effluent. However, this research concluded that the dairy effluent can be used in the fertigation of Panicum maximum cv. Mombaça grass with application rate of up to 600 Kg ha-1sodium.   Originality/value: This study indicates an increase in the amount of sodium to be delivered to the soil through the use of effluents.