1. Repositorio institucional de CLACSO
2. Colección de los Centros Asociados
3. Brasil
4. Núcleo de Pesquisa sobre Crianças, Adolescestes e Jovens - Universidade Federal do Piauí - NUPEC/UFPI - Cosecha

Título :	Pasture edaphic attributes in northwest region of Rio de Janeiro State, Brazil Atributos edáficos em pastagens da região noroeste do estado do Rio de Janeiro
Palabras clave :	soil aggregation;humic substances;organic carbon;grasses;agregação do solo;substâncias húmicas;carbono orgânico
Editorial :	Federal University of Piauí
Descripción :	The aim of this study was to evaluate the seasonal variation of the attributes of soil quality indicators in areas of pasture planted with Brachiaria, Tifton 85 and Suazi in the municipality of Itaperuna, RJ, Brazil. The experimental design was completely randomized split plot with six replications. Soil samples were collected during the dry season (August 2004) and the rainy season (December 2004). These were evaluated in relation aggregate stability, using the mean weight diameter (MWD) and the proportion of stable aggregates (% AGRI) in water > 2.00 mm, the total organic carbon (TOC), the carbon from the humin fraction (C-HUM), carbon of humic acid fraction (C-FAH) and fulvic (C-FAF). In addition, samples were also collected for quantification of root dry matter (DM). The area with Brachiaria had higher MWD and % AGRI > 2.00 mm in the dry season, a pattern that is observed for Tifton 85 area, the rainy season. The highest TOC and C-HUM were found in area of Brachiaria in the two periods. The Tifton 85 had the lowest root of DM (10-30 cm). For the study conditions in the dry season, Brachiarias a cover plant more efficient to promote improvements in attributes (MWD, AGRI%> 2.00 mm and TOC) evaluated independente of the depth. For the rainy season, this pattern was observed for Tifton 85. The coverage of Brachiaria and Tifton 85 lead in higher root dry weight at a 10-30 cm soil depth compared with the coverage of Suazi, regardless of the season, demonstrating the potential of these grasses for use in projects of recovery of degraded areas. O objetivo deste trabalho foi avaliar a variação sazonal dos atributos indicadores da qualidade do solo em áreas de pastagens plantadas com as gramíneas Braquiária, Tifton 85 e Suázi, no município de Itaperuna, RJ. O delineamento experimental foi o inteiramente casualizado em parcelas subdivididas, com seis repetições. As amostras de solo foram coletadas no período seco (agosto de 2004) e no período chuvoso (dezembro de 2004). Nestas foram avaliados a estabilidade dos agregados, por meio do diâmetro médio ponderado (DMP) e da proporção de agregados estáveis (% AGRI) em água > 2,00 mm, o teor de carbono orgânico total (COT), o carbono da fração humina (C-HUM), carbono da fração ácidos húmicos (C-FAH) e fulvicos (C-FAF). Além disto, também foram coletadas amostras do sistema radicular para quantificação da massa seca (MS). A área com Braquiária apresentou maiores valores de DMP e % AGRI >2,00 mm no período seco, sendo este padrão observado para área de Tifton 85, no período chuvoso. Os maiores teores de COT e C-HUM foram encontrados na área de Braquiária, nos dois períodos avaliados. A gramínea Tifton 85 apresentou menor valor de MS de raiz (10-30 cm). Para as condições do presente estudo, na época seca, a Braquiária apresenta-se como planta de cobertura mais eficiente para promover melhorias nos atributos avaliados (DMP, % AGRI > 2,00 mm e COT) independente da profundidade avaliada. Para a época chuvosa, este padrão foi observado para o Tifton 85. As coberturas de Braquiária e Tifton-85 acarretam em maiores valores de massa seca de raiz na profundidade de 10-30 cm quando comparadas com a cobertura de Suázi, independente da estação, demonstrando potencial dessas gramíneas para utilização em projetos de recuperação de áreas degradadas. Pasture edaphic attributes in northwest region of Rio de Janeiro State, BrazilAbstractThe aim of this study was to evaluate the seasonal variation of the attributes of soil quality indicatorsin areas of pasture planted with Brachiaria, Tifton 85 and Suazi in the municipality of Itaperuna,RJ, Brazil. The experimental design was completely randomized split plot with six replications. Soilsamples were collected during the dry season (August 2004) and the rainy season (December 2004).These were evaluated in relation aggregate stability, using the mean weight diameter (MWD) andthe proportion of stable aggregates (% AGRI) in water > 2.00 mm, the total organic carbon (TOC),the carbon from the humin fraction (C-HUM), carbon of humic acid fraction (C-FAH) and fulvic(C-FAF). In addition, samples were also collected for quantification of root dry matter (DM). The areawith Brachiaria had higher MWD and % AGRI > 2.00 mm in the dry season, a pattern that is observedfor Tifton 85 area, the rainy season. The highest TOC and C-HUM were found in area of Brachiaria inthe two periods. The Tifton 85 had the lowest root of DM (10-30 cm). For the study conditions in thedry season, Brachiarias a cover plant more efficient to promote improvements in attributes (MWD,AGRI%> 2.00 mm and TOC) evaluated independente of the depth. For the rainy season, this patternwas observed for Tifton 85. The coverage of Brachiaria and Tifton 85 lead in higher root dry weight ata 10-30 cm soil depth compared with the coverage of Suazi, regardless of the season, demonstratingthe potential of these grasses for use in projects of recovery of degraded areas.
URI :	http://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/77495
Otros identificadores :	https://comunicatascientiae.com.br/comunicata/article/view/47 10.14295/cs.v1i2.47
Aparece en las colecciones:	Núcleo de Pesquisa sobre Crianças, Adolescestes e Jovens - Universidade Federal do Piauí - NUPEC/UFPI - Cosecha

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