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Registros recuperados: 5
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Carbon balance and crop residue management in dynamic equilibrium under a no-till system in Campos Gerais Rev. Bras. Ciênc. Solo
Ferreira,Ademir de Oliveira; Sá,João Carlos de Moraes; Harms,Mônica Gabrielle; Miara,Simone; Briedis,Clever; Quadros Netto,Caio; Santos,Josiane Burkner dos; Canalli,Lutécia Beatriz.
The adoption of no-tillage systems (NT) and the maintenance of crop residues on the soil surface result in the long-term increase of carbon (C) in the system, promoting C sequestration and reducing C-CO2 emissions to the atmosphere. The purpose of this study was to evaluate the C sequestration rate and the minimum amount of crop residues required to maintain the dynamic C equilibrium (dC/dt = 0) of two soils (Typic Hapludox) with different textural classes. The experiment was arranged in a 2 x 2 x 2 randomized block factorial design. The following factors were analyzed: (a) two soil types: Typic Hapludox (Oxisol) with medium texture (LVTM) and Oxisol with clay texture (LVTA), (b) two sampling layers (0-5 and 5-20 cm), and (c) two sampling periods (P1 -...
Tipo: Info:eu-repo/semantics/article Palavras-chave: C sequestration rate; Soil texture; Subtropical soils.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000500022
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Causes of morphological discontinuities in soils of Depressão Central, Rio Grande do Sul State, Brazil Scientia Agricola
Michelon,Cristiane Regina; Azevedo,Antonio Carlos de; Pedron,Fabrício de Araújo; Dalmolin,Ricardo Simão Diniz; Stürmmer,Sidinei Klochnner; Gonçalves,Juliana; Jesus,Sérgio Luis de.
Morphological, particularly textural, discontinuities between horizons increase soil erodibility in Depressão Central, Rio Grande do Sul State (Brazil). Characterization of such discontinuities would help to understand landscape evolution and to model near-surface hydrology. The objective of this research was to explore the relationship between morphological discontinuity and deposition of transported materials during pedogenesis. Transported material was meant to be mineral particles found in the soil profile, transported probably by water or gravity, that were not present neither in the parent material nor derived from it. Five soils of this region (two Alfisols, two Ultisols and one Mollisol) were sampled and morphological, sand grain size statistics,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil morphology; Subtropical soils; Soil discontinuity.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300010
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Formation of ternary organic acids-Fe-P complexes on the growth of wheat (Triticum aestivum) AGRIAMBI
Schmitt,Djalma E.; Gatiboni,Luciano C.; Orsoletta,Daniel J. D.; Brunetto,Gustavo.
ABSTRACT Phosphorus (P) reacts with chemical and mineralogical constituents in the soil, mainly in tropical and subtropical soils. Therefore, strategies have been used to reduce the adsorption of P to the soil, among them, the formation of complexes that could decrease P adsorption to the soil. Two experiments were carried out to evaluate the formation of organic acid-Fe-P complexes in the laboratory and the efficiency of these complexes on the growth of wheat plants (T. aestivum) grown under greenhouse conditions. In experiment 1, seven low-molecular-weight organic acids (OA) were selected and a protocol for the formation of complexes between organic acid and Fe3+ at pH 4.0 was performed. After stirring, P was added to the organic acid-Fe complex to form...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phosphate fertilization; Available P; Subtropical soils.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001000702
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Postharvest nitrous oxide emissions from a subtropical oxisol as influenced by summer crop residues and their management Rev. Bras. Ciênc. Solo
Escobar,Luisa Fernanda; Amado,Telmo Jorge Carneiro; Bayer,Cimélio; Chavez,Luis Fernando; Zanatta,Josiléia Acordi; Fiorin,Jackson Ernani.
Nitrous oxide (N2O) is the most important non-CO2 greenhouse gas and soil management systems should be evaluated for their N2O mitigation potential. This research evaluated a long-term (22 years) experiment testing the effect of soil management systems on N2O emissions in the postharvest period (autumn) from a subtropical Rhodic Hapludox at the research center FUNDACEP, in Cruz Alta, state of Rio Grande do Sul. Three treatments were evaluated, one under conventional tillage with soybean residues (CTsoybean) and two under no-tillage with soybean (NTsoybean) and maize residues (NTmaize). N2O emissions were measured eight times within 24 days (May 2007) using closed static chambers. Gas flows were obtained based on the relations between gas concentrations in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Global warming; Subtropical soils; Greenhouse gases; Soil tillage; Crop rotation.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000200024
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The fungicide mancozeb affects soil invertebrates in two subtropical Brazilian soils. Repositório Alice
CARNIEL, L. S. C.; NIEMEYER, J. C.; OLIVEIRA FILHO, L. C. I. de; ALEXANDRE, D.; GEBLER, L.; KLAUBERG-FILHO, O..
Mancozeb is a dithiocarbamate non-systemic fungicide widely used to control fungal diseases of plants, commonly applied in apple orchards in Brazil. Instead of its common use, there are no reports about the risk to non-target organisms in Brazilian soils. We studied the risk of Mancozeb (in the commercial formulation Dithane® NT) for standard invertebrate species (Folsomia candida, Eisenia andrei and Enchytraeus crypticus) in two subtropical Brazilian soils, Oxisol and Ultisol, which are representative of apple production areas in Brazil. Reproduction and survival tests were carried out following ISO guidelines. Results showed that Mancozeb in Oxisol reduced the survival and reproduction of collembolans (LC50 54.43 and EC50 2.72mg a.i. kg-1) and...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Dithiocarbamate; Soil ecotoxicology; Pesticides; Soil fauna; Subtropical soils.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1109797
Registros recuperados: 5
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