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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
12/06/2003 |
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Data da última atualização: |
12/06/2003 |
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Autoria: |
REIS, R.F.dos; GOES, A.de; PEREIRA, G.T. |
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Título: |
Efeito da aplicacao de oxicloreto de cobre em diferentes epocas no controle da mancha preta dos citros causada por Guignardia citricarpa. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Summa Phytopathologica, Botucatu,SP, v.29, n.1, p.12-18, jan./mar. 2003. |
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Idioma: |
Português |
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Palavras-Chave: |
Citrus sinensis; Controle; Doenca de planta; Fungicida; Laranja; Mancha preta; Modelo matematico. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00676naa a2200217 a 4500
001 1025359
005 2003-06-12
008 2003 bl uuuu u00u1 u #d
100 1 $aREIS, R.F.dos
245 $aEfeito da aplicacao de oxicloreto de cobre em diferentes epocas no controle da mancha preta dos citros causada por Guignardia citricarpa.
260 $c2003
653 $aCitrus sinensis
653 $aControle
653 $aDoenca de planta
653 $aFungicida
653 $aLaranja
653 $aMancha preta
653 $aModelo matematico
700 1 $aGOES, A.de
700 1 $aPEREIRA, G.T.
773 $tSumma Phytopathologica, Botucatu,SP$gv.29, n.1, p.12-18, jan./mar. 2003.
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Biblioteca(s): |
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Data corrente: |
29/07/2021 |
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Data da última atualização: |
29/07/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - A |
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Autoria: |
RAUBER, L. R.; SEQUINATTO, L.; KAISER, D. R.; BERTOL, I.; BALDISSERA, T. C.; GARAGORRY, F. C.; SBRISSIA, A. F.; PEREIRA, G. E.; PINTO, C. E. |
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Título: |
Soil physical properties in a natural highland grassland in southern Brazil subjected to a range of grazing heights. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Agriculture, Ecosystems and Environment, Netherlands, v. 319, p. 1-14, 2021. |
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Idioma: |
Inglês |
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Conteúdo: |
Natural grasslands in southern Brazil are ecosystems that are naturally adapted to grazing. Despite the pro- ductivity and ecological relevance of these ecosystems, the effects of grazing intensity on their soil quality are still underexplored. This work aimed to determine whether increasing the grazing intensity would jeopardize the soil structure in a natural highland grassland in southern Brazil. Pastures were evaluated at four pregrazing canopy heights, 0.12, 0.20, 0.28 and 0.36 m, with Andropogon lateralis Nees as the reference species, and in one ungrazed control area. The pastures were intermittently stocked, and the postgrazing heights corresponded to 60% of the pregrazing targets (i.e., the postgrazing heights were 0.072, 0.12, 0.168 and 0.216 m). The experi- ment started in 2015 and was conducted for three years, with evaluations of soil physical properties performed in the final year. Forage growth and grazing were concentrated from October to May; during the winter, no grazing occurred for a period of approximately 4 months. The soil structure was evaluated at two points: after the end of the 2017/2018 grazing season, in June, and after the winter period, in October. Regardless of the canopy height, the presence of grazing animals increased the degree of compaction at the soil surface (0.0?0.05 m) to an in- termediate level immediately after grazing, did not disaggregate the soil or change its carbon and nitrogen stocks, and increased soil macroporosity and water infiltration compared to those in the exclusion area (control). Increasing the grazing intensity (i.e., increasing the grazing frequency, corresponding to lower pregrazing canopy heights) increased the soil macroporosity and water infiltration rate, decreased the soil moisture and increased the soil penetration resistance. Except at the 0.12 m canopy height, the exclusion of grazing for 4 months allowed the soil water infiltration in the grazed plots to return to a level similar to that in the exclusion area. We conclude that there are a wide range of grazing intensities (corresponding to canopy heights of 0.12?0.36 m) that do not jeopardize the soil structural quality in highland grasslands. Furthermore, it was not possible to determine whether canopy heights below 0.12 m would disrupt the synergism at the soil-plant-animal interface in these natural ecosystems. MenosNatural grasslands in southern Brazil are ecosystems that are naturally adapted to grazing. Despite the pro- ductivity and ecological relevance of these ecosystems, the effects of grazing intensity on their soil quality are still underexplored. This work aimed to determine whether increasing the grazing intensity would jeopardize the soil structure in a natural highland grassland in southern Brazil. Pastures were evaluated at four pregrazing canopy heights, 0.12, 0.20, 0.28 and 0.36 m, with Andropogon lateralis Nees as the reference species, and in one ungrazed control area. The pastures were intermittently stocked, and the postgrazing heights corresponded to 60% of the pregrazing targets (i.e., the postgrazing heights were 0.072, 0.12, 0.168 and 0.216 m). The experi- ment started in 2015 and was conducted for three years, with evaluations of soil physical properties performed in the final year. Forage growth and grazing were concentrated from October to May; during the winter, no grazing occurred for a period of approximately 4 months. The soil structure was evaluated at two points: after the end of the 2017/2018 grazing season, in June, and after the winter period, in October. Regardless of the canopy height, the presence of grazing animals increased the degree of compaction at the soil surface (0.0?0.05 m) to an in- termediate level immediately after grazing, did not disaggregate the soil or change its carbon and nitrogen stocks, and increased soil macroporosity and water... Mostrar Tudo |
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Palavras-Chave: |
Beef cattle Soil compaction Water infiltration Soil functionality Andropogon lateralis Nees. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 03169naa a2200229 a 4500
001 1131058
005 2021-07-29
008 2021 bl uuuu u00u1 u #d
100 1 $aRAUBER, L. R.
245 $aSoil physical properties in a natural highland grassland in southern Brazil subjected to a range of grazing heights.$h[electronic resource]
260 $c2021
520 $aNatural grasslands in southern Brazil are ecosystems that are naturally adapted to grazing. Despite the pro- ductivity and ecological relevance of these ecosystems, the effects of grazing intensity on their soil quality are still underexplored. This work aimed to determine whether increasing the grazing intensity would jeopardize the soil structure in a natural highland grassland in southern Brazil. Pastures were evaluated at four pregrazing canopy heights, 0.12, 0.20, 0.28 and 0.36 m, with Andropogon lateralis Nees as the reference species, and in one ungrazed control area. The pastures were intermittently stocked, and the postgrazing heights corresponded to 60% of the pregrazing targets (i.e., the postgrazing heights were 0.072, 0.12, 0.168 and 0.216 m). The experi- ment started in 2015 and was conducted for three years, with evaluations of soil physical properties performed in the final year. Forage growth and grazing were concentrated from October to May; during the winter, no grazing occurred for a period of approximately 4 months. The soil structure was evaluated at two points: after the end of the 2017/2018 grazing season, in June, and after the winter period, in October. Regardless of the canopy height, the presence of grazing animals increased the degree of compaction at the soil surface (0.0?0.05 m) to an in- termediate level immediately after grazing, did not disaggregate the soil or change its carbon and nitrogen stocks, and increased soil macroporosity and water infiltration compared to those in the exclusion area (control). Increasing the grazing intensity (i.e., increasing the grazing frequency, corresponding to lower pregrazing canopy heights) increased the soil macroporosity and water infiltration rate, decreased the soil moisture and increased the soil penetration resistance. Except at the 0.12 m canopy height, the exclusion of grazing for 4 months allowed the soil water infiltration in the grazed plots to return to a level similar to that in the exclusion area. We conclude that there are a wide range of grazing intensities (corresponding to canopy heights of 0.12?0.36 m) that do not jeopardize the soil structural quality in highland grasslands. Furthermore, it was not possible to determine whether canopy heights below 0.12 m would disrupt the synergism at the soil-plant-animal interface in these natural ecosystems.
653 $aBeef cattle Soil compaction Water infiltration Soil functionality Andropogon lateralis Nees
700 1 $aSEQUINATTO, L.
700 1 $aKAISER, D. R.
700 1 $aBERTOL, I.
700 1 $aBALDISSERA, T. C.
700 1 $aGARAGORRY, F. C.
700 1 $aSBRISSIA, A. F.
700 1 $aPEREIRA, G. E.
700 1 $aPINTO, C. E.
773 $tAgriculture, Ecosystems and Environment, Netherlands$gv. 319, p. 1-14, 2021.
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