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| Rachwal,Marcos Fernando Glück; Zanatta,Josiléia Acordi; Dieckow,Jeferson; Denega,Genuir Luis; Curcio,Gustavo Ribas; Bayer,Cimélio. |
| Soil can be either source or sink of methane (CH4), depending on the balance between methanogenesis and methanotrophy, which are determined by pedological, climatic and management factors. The objective of this study was to assess the impact of drainage of a highland Haplic Histosol on CH4 fluxes. Field research was carried out in Ponta Grossa (Paraná, Brazil) based on the measurement of CH4 fluxes by the static chamber method in natural and drained Histosol, over one year (17 sampling events). The natural Histosol showed net CH4 eflux, with rates varying from 238 µg m-2 h-1 CH4, in cool/cold periods, to 2,850 µg m-2 h-1 CH4, in warm/hot periods, resulting a cumulative emission of 116 kg ha-1 yr-1 CH4. In the opposite, the drained Histosol showed net... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Greenhouse gas; Water sources; Water-table; Gravimetric moisture; Air temperature; Rainfall. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000200013 |
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| Zanatta,Josiléia Acordi; Bayer,Cimélio; Vieira,Frederico C.B.; Gomes,Juliana; Tomazi,Michely. |
| Nitrogen fertilizers increase the nitrous oxide (N2O) emission and can reduce the methane (CH4) oxidation from agricultural soils. However, the magnitude of this effect is unknown in Southern Brazilian edaphoclimatic conditions, as well as the potential of different sources of mineral N fertilizers in such an effect. The aim of this study was to investigate the effects of different mineral N sources (urea, ammonium sulphate, calcium nitrate, ammonium nitrate, Uran, controlled- release N fertilizer, and urea with urease inhibitor) on N2O and CH4 fluxes from Gleysol in the South of Brazil (Porto Alegre, RS), in comparison to a control treatment without a N application. The experiment was arranged in a randomized block with three replications, and the N... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen fertilization; Environmental impacts; Agriculture; Greenhouse effect. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500018 |
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| Zanatta,Josiléia Acordi; Vieira,Frederico Costa Beber; Briedis,Clever; Dieckow,Jeferson; Bayer,Cimélio. |
| ABSTRACT: Management systems to improve soil quality are essential for agricultural and environmental sustainability. We assessed the quality of soil management systems applied to a subtropical Acrisol in terms of the carbon management index (CMI), the stratification ratio for total organic carbon (SR-TOC) and light fraction of organic matter (SR-LF). In addition, we examined their relationship to chemical, physical and biological soil quality indicators, as well as to maize yield. The study was conducted on a long-term experiment (18 years) in southern Brazil involving two different systems [no tillage (NT) and conventional tillage (CT)], two cropping systems [black oat/maize (O/M) and black oat + vetch/maize + cowpea (OV/MC)] and two nitrogen fertilizer... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation agriculture; Cropping systems; No-till; Quality indicators. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600501 |
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