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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sul. Para informações adicionais entre em contato com cppsul.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sul. |
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Data corrente: |
16/09/2021 |
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Data da última atualização: |
16/09/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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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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Afiliação: |
LUCAS RAIMUNDO RAUBER, UDESC; LETÍCIA SEQUINATTO, UDESC; DOUGLAS RODRIGO KAISER, UFFS; ILDEGARDIS BERTOL, UDESC; TIAGO CELSO BALDISSERA, EPAGRI; FABIO CERVO GARAGORRY, CPPSUL; ANDRÉ FISCHER SBRISSIA, UDESC; GUSTAVO EDUARDO PEREIRA, UDESC; CASSIANO EDUARDO PINTO, EPAGRI. |
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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 & Environment , v. 319, 107515, Oct. 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 productivity 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 experiment 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 intermediate 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 productivity 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 experiment 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 intermediate level immediately after grazing, did not disaggregate the soil or change its carbon and nitrogen stocks, and increased soil macroporosity and water infil... Mostrar Tudo |
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Thesagro: |
Gado de Corte; Pastagem; Solo. |
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Categoria do assunto: |
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Marc: |
LEADER 03120naa a2200253 a 4500
001 2134508
005 2021-09-16
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 productivity 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 experiment 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 intermediate 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.
650 $aGado de Corte
650 $aPastagem
650 $aSolo
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 $tAgriculture, Ecosystems & Environment$gv. 319, 107515, Oct. 2021.
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Embrapa Pecuária Sul (CPPSUL) |
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Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
19/07/2002 |
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Data da última atualização: |
19/07/2002 |
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Autoria: |
MAEDA, J. A.; LAGO, A. A. MIRANDA, L. T. de; TELLA, R. de. |
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Título: |
Armazenamento de Sementes de Cultivares de Milho e Sorgo com Resistências Ambientais Diferentes. |
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Ano de publicação: |
1987 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, v.22, n.1, p.1-7, jan.1987 |
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Idioma: |
Português |
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Conteúdo: |
Sementes das cultivares de milho (Zea mays L.) IAC Maya, IAC Maya Latente e Hmd 7974 e de sorgo (Sorghum vulgare L., cv. Sart) foram armazenadas em condições controladas de 30OC/75% UR, 30OC/55% UR, 30OC/33% UR, 20OC/75% UR, 20OC/55% UR e 20OC/33% UR e em condições não controladas de armazém das regiões de Campinas, Ribeirão Preto e Pariquera-Açú, no Estado de São Paulo. A gradativa deterioração das sementes foi avaliada pelo teste padrão de germinação realizado no início do armazenamento e a cada quatro meses por um período total de 48 meses. A velocidade de deterioração das sementes esteve diretamente relacionada com a temperatura e o conteúdo de umidade em equilíbrio com a umidade relativa dos diversos ambientes. As condições controladas mais adequadas à manutenção da longevidade das sementes foram 20OC/33% UR e 20OC/55% UR. A região de Campinas foi mais favorável que a de Ribeirão Preto para o armazenamento das sementes; Pariquera-Açú se comportou como unia área inadequada para essa finalidade. A longevidade das sementes do milho híbrido 'Hmd 7974' foi superior à das sementes das outras cultivares, inclusive à de sorgo. 0 fator "latente" parece ter conferido maior tolerância ao armazenamento às sementes da 'IAC Maya Latente', quando comparada com as da 'IAC Maya'.
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Palavras-Chave: |
fator "latente". |
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Thesagro: |
Deterioração; Sorghum Vulgare; Zea Mays. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01913naa a2200193 a 4500
001 1084270
005 2002-07-19
008 1987 bl uuuu u00u1 u #d
100 1 $aMAEDA, J. A.
245 $aArmazenamento de Sementes de Cultivares de Milho e Sorgo com Resistências Ambientais Diferentes.
260 $c1987
520 $aSementes das cultivares de milho (Zea mays L.) IAC Maya, IAC Maya Latente e Hmd 7974 e de sorgo (Sorghum vulgare L., cv. Sart) foram armazenadas em condições controladas de 30OC/75% UR, 30OC/55% UR, 30OC/33% UR, 20OC/75% UR, 20OC/55% UR e 20OC/33% UR e em condições não controladas de armazém das regiões de Campinas, Ribeirão Preto e Pariquera-Açú, no Estado de São Paulo. A gradativa deterioração das sementes foi avaliada pelo teste padrão de germinação realizado no início do armazenamento e a cada quatro meses por um período total de 48 meses. A velocidade de deterioração das sementes esteve diretamente relacionada com a temperatura e o conteúdo de umidade em equilíbrio com a umidade relativa dos diversos ambientes. As condições controladas mais adequadas à manutenção da longevidade das sementes foram 20OC/33% UR e 20OC/55% UR. A região de Campinas foi mais favorável que a de Ribeirão Preto para o armazenamento das sementes; Pariquera-Açú se comportou como unia área inadequada para essa finalidade. A longevidade das sementes do milho híbrido 'Hmd 7974' foi superior à das sementes das outras cultivares, inclusive à de sorgo. 0 fator "latente" parece ter conferido maior tolerância ao armazenamento às sementes da 'IAC Maya Latente', quando comparada com as da 'IAC Maya'.
650 $aDeterioração
650 $aSorghum Vulgare
650 $aZea Mays
653 $afator "latente"
700 1 $aLAGO, A. A. MIRANDA, L. T. de
700 1 $aTELLA, R. de
773 $tPesquisa Agropecuária Brasileira, Brasília$gv.22, n.1, p.1-7, jan.1987
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