CHEMICAL PROPERTIES OF SOIL FERTIRRIGATED WITH DAIRY AND SLAUGHTERHOUSE WASTEWATER

ABSTRACT The aim of this study was to evaluate the soil chemical properties submitted to fertigation with slaughterhouse (SW) and dairies (DW) wastewater. The experiment was conducted in the Environmental Engineering Center and Sanitary of UFLA/MG in PVC columns filled with Dark Red Latosol (Oxisol) and randomly distributed. The treatments applied with nitrogen based load (300 kg ha years-1 of N) consisted of four doses of SW and DW (100, 200, 300 and 400% of the recommendation) and AQT0 control at random. The soil was collected at a depth of 0.30 m and, subsequently, characterized in terms of physical, chemical and physicochemical. The application of treatment of the largest irrigation of DW provided, after 120 days of monitoring, N concentration of 1.85 g kg-1. However, the treatment with AQT0 obtained N concentration of 0.81 g kg-1, in the soil. We observed that the largest irrigation of SW provided increases of 2.62 and 5.49 g kg-1, respectively, in the P and K concentrations of the soil. There was quadratic increase in the N concentration in the 0.30 m soil depth of the columns with the increase in the applied irrigations of SW and DW, being obtained maximum values of 1.85 and 1.02 g kg-1 that were obtained in the relative irrigation of the application dose of 600 kg ha-1 of N.

摘要
本研究旨在评估经屠宰场废水（SW）与乳品厂废水（DW）灌溉施肥后的土壤化学性质。实验于巴西米纳斯吉拉斯州拉夫拉斯联邦大学（UFLA/MG）环境与卫生工程中心开展，采用填充有暗红色砖红壤（Oxisol）的PVC柱随机布设。试验以氮负荷为基准设置处理组，施氮量为300 kg·ha⁻¹·a⁻¹，包含4个梯度的SW和DW灌溉剂量（分别为推荐剂量的100%、200%、300%与400%），并以AQT0作为空白对照，所有处理均随机分配。
于0.30 m土层采集土壤样品，随后对其物理、化学及理化性质进行表征分析。经120天监测后，施加最高剂量DW灌溉的处理组土壤氮浓度为1.85 g·kg⁻¹；而空白对照AQT0组的土壤氮浓度为0.81 g·kg⁻¹。研究发现，施加最高剂量SW灌溉可使土壤磷、钾浓度分别提升至2.62 g·kg⁻¹与5.49 g·kg⁻¹。随着SW与DW灌溉施用量的增加，柱体0.30 m土层的土壤氮浓度呈二次函数增长趋势；当施氮量为600 kg·ha⁻¹时，可分别获得1.85 g·kg⁻¹与1.02 g·kg⁻¹的最大氮浓度。