|
|
|
|
|
| Corrêa,Rodrigo Studart; Silva,Douglas José da. |
| ABSTRACT Biosolids have been produced by various stabilization processes of sewage sludge, but little attention has been given to the effects of such treatments on their effectiveness to supply nitrogen for plant growth. Here, we investigated these effects by cultivating Lolium perenne (ryegrass) in two Australian soils, a sandy Spodosol and a clayey Oxisol. Biosolids stabilized by either aerobic digestion, composting, CaO-liming, 250 oC heat-drying or solar irradiation of domestic sewage sludge were applied to soils at 10 increasing rates (0.25-8.0 dry Mg ha-1), and chemically fertilized soils were used as reference. Results showed that the stabilization processes affected biosolids-N agronomic rates and effectiveness to yield plant biomass, which was a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sewage sludge; Organic-N; Plant nutrients; Oxisol; Spodosol. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100523 |
| |
|
|
| Vale Júnior,José Frutuoso do; Nicodem,Steven; Melo,Valdinar Ferreira; Uchôa,Sandra Catia Pereira; Cruz,Diego Lima de Sousa. |
| ABSTRACT Soil organic matter (SOM) fractions result from a variety of environmental processes, which affect incorporation and production rates, decomposition, alteration, and/or mineralization of organic matter. The aim of this study was to characterize SOM under the environments of rain forest, wooded campinarana (grasslands), arboreal-shrubby campinarana, grassy-woody campinarana, and pioneer plants of the Viruá National Park, in the north of the Brazilian Amazon. After chemical and physical characterization and soil classification, total organic carbon (TOC), total N, microbial activity, organic C from fulvic acid fractions (FA), humic acid (HA), and humin (Hu) were determined at two depths (0.00-0.15 and 0.15-0.30 m). The TOC was lower in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil organic carbon; Humic substances; Campinarana; Quartzipsamment; Spodosol. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100408 |
| |
|
|
|
