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Provedor de dados:  Scientia Agricola
País:  Brazil
Título:  Soil bulk density and biomass partitioning of Brachiaria decumbens in a silvopastoral system
Autores:  Paciullo,Domingos Sávio Campos
Castro,Carlos Renato Tavares de
Gomide,Carlos Augusto de Miranda
Fernandes,Priscila Beligoli
Rocha,Wadson Sebastião Duarte da
Müller,Marcelo Dias
Rossiello,Roberto Oscar Pereyra
Data:  2010-10-01
Ano:  2010
Palavras-chave:  Forage mass
Root mass
Soil compaction
Shoot/root ratio
Resumo:  Shade in silvopastoral systems improves the thermal comfort of animals, but it may also affect the pasture productivity and can contribute to soil compaction in the shaded areas due to the increase in the number of animals looking for comfort. The effect of grazing at various distances from tree rows (under the tree canopy, at 6 and at 12 m away from the trees) on the soil bulk density and on the aerial and root biomass of Brachiaria decumbens was evaluated in both the dry and the rainy seasons. The study was carried out on an Orthic Ferralsol in a randomized block design with two replications. Tree rows were composed of Eucalyptus grandis and Acacia mangium species, and the paddocks were submitted to a rotational stocking management, using Holstein (Bos taurus) × Zebu (Bos indicus) heifers. The shade intensity in the pasture decreased with an increasing distance from the tree row. Soil bulk density did not vary with the distance from the tree row, but varied seasonally, being greater in the rainy season (1.47 g cm-3) than in the dry season (1.28 g cm-3). Green forage and root mass, expressed as dry matter, were lower under the tree canopy and were greater in the rainy season. There were decreases of 22.3 and 41.4% in the aerial and root biomasses, respectively, in the tree rows. The greatest shoot/root ratio for B. decumbens under moderate and intensive shading indicates a modification in the forage biomass allocation pattern that favours the aerial development in detriment of the root system.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação:  10.1590/S0103-90162010000500014
Formato:  text/html
Fonte:  Scientia Agricola v.67 n.5 2010
Direitos:  info:eu-repo/semantics/openAccess

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