As águas residuais são potenciais fontes de nutrientes, matéria orgânica e água se usadas na fertirrigação, contribuindo para o aumento de produção e atividade biológica do solo. Objetivou-se avaliar a respiração basal do solo, produtividade e remoção de nutrientes por Tifton 85 após aplicação de água residual de laticínios (ARL). Conduziu-se o ensaio na Universidade Federal de Lavras, em colunas de PVC com 0,30 m de diâmetro e 1,2 m de profundidade, preenchidas com Latossolo Vermelho Distrófico e cultivadas com Tifton 85. Os tratamentos compreenderam de adubação mineral (A Q T0) recomendada para esta espécie (300 kg ha-1 ano-1 de N), e quatro doses de ARL: 100 (A L T1), 200 (A L T2), 300 (A L T3) e 400% (A L T4) da recomendação de N. Realizaram-se três cortes, aos 60, 90 e 120 dias após o transplante. As crescentes dosagens de ARL não proporcionaram incrementos na respiração basal do solo. A maior produtividade foi de 15,11 t ha-1, ocorrida no segundo corte após dosagem de 7203 m³ ha-1 de ARL (A L T4), proporcionando, assim, consideráveis remoções de macro e micronutrientes neste corte. Os resultados revelaram a necessidade para efetuar tratamentos adequados às ARLs antes de sua aplicação em solos agrícolas, bem como estudos mais aprofundados ao tema abordado.

The wastewater is a potential source of nutrients, organic matter and water on the fertirrigation, contributing to increased production and biological activity of the soil. The objective of this study was to evaluate soil basal respiration, yield and nutrient removal by Tifton 85 grass after application of dairy wastewater (DW). The test was conducted at the Federal University of Lavras, in PVC columns with 0.30 m of diameter and 1.2 m deep, filled with Dystrofic Red Latosol cultivated with Tifton 85 grass. The treatments consisted of a (A Q T0) control with recommended mineral fertilization for Tifton 85 grass (300 kg ha-1 year-1 of N), and four doses of DW: 100 (A L T1), 200 (A L T2), 300 (A L T3) e 400% (A L T4) of the recommendation. Three cuts were performed, at 60, 90 and 120 days after planting. The doses of DW did not provide increases in soil basal respiration between treatments. The highest yield for 15.11 t ha-1, occurred in the second cut after the dose of 7203 m³ ha-1 of DW (A L T4), providing a considerable removal of macro and micronutrients. The results revealed the need to make appropriate treatments to ARLs your before application in agricultural soils, well as more detailed studies the subject.

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.

ABSTRACT The objective of this study was to evaluate the quality of the percolate in soil columns cultivated with Tiffon-grass 85 under different wastewater rates from swine slaughterhouse and dairy. The experiment was conducted at the Department of Engineering at the Federal University of Lavras, in PVC columns with 0.30 m of diameter and 1.2 m deep, filled with Dark Red Latosol cultivated with Tifton-grass 85. The treatments consisted of a (AQT0) control with recommended chemical fertilization for Tifton-grass 85 (300 kg ha-1 year-1 of N), and four doses of SSW and DPW (100, 200, 300 and 400% of the recommendation) in a CRD with 3 replications. The samples of percolated were collected and characterized weekly. The treatments of highest dosage have obtained COD, after 120 days, of 47.7 mg L-1 (AAT3) and 38.6 mg L-1 (AAT4). Although nitrate concentrations were elevated on the earlier months, the greater assimilation of nutrients by the Tifton-grass 85 and the reduction of the mineralization of organic material resulted in lower nitrate concentrations of 10 mg L-1.

ABSTRACT: The aim of this study was to evaluate the performance of Tifton 85 grass cultivated in soil columns and fertilized with different wastewater doses of swine slaughterhouse. 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 de N years−1) consisted of four doses of SW and AQT0 control at random. Three cuts were performed, at 60, 90 and 120 days after planting. The highest yields were 10.06, 16.82 and 20.39 t ha−1 in AQT0, AAT4 and AAT3 treatments, respectively. With the increase of nutrients by N rates and root development of Tifton 85 grass, we observed higher extractions of N, P and K in the second and third cut, with maximum extraction of 384 and 10.3 kg ha−1 of N and P in the higher dose treatments (AAT4), while the maximum extraction of the potassium was 117.7 kg ha−1 in the AAT3 treatment. There was productivity restriction in the third cut due to the reduction of availability of essential nutrients and losses by leaching.