Estudio de la compactación de un Ferralsol manejado con un sistema de no laboreo en Selvíria (MS, Brasil)

No tillage management is widely used by the Brazilian farmers and technicians like a soil conservation system, which reduces the soil losses by water erosion, increasing the infiltrated and stored water in soil, warranting environmental sustainability. No-tillage system does not invert the soil; it causes the creation of a compacted layer. The samples were taken in the agricultural year 2005/2006 in an Oxisoil at Selviria (MS/Brazil). The tillage management in the last 15 years was no-tillage system with crop rotation (maize -Zea mays L./bean - Phaseolus vulgaris L.). The analyzed soil physical properties were bulk density (BS), gravimetric water content (U) and mechanical resistance to penetration (RP) at three depths: 0-0.10 m, 0.10-0.20 m and 0.20-0.30 m. The samples were taken in a mesh with 117 sampled points covering an area of 0.16 ha. It was investigated the existence of compacted soil layer, using the mechanical resistance to penetration to 0.60 m depth with soil water content at field capacity. The data shows low coefficient of variation, except the resistance penetration data. Bulk density and gravimetric water content has a normal distribution. Only resistance to penetration at 0.10-0.20 m depth layer has a normal distribution. The correlation between different properties was low. The bulk density increases with depth; the increase of the values of soil bulk density are consistent with data in other papers, indicating there are not compaction problems for the crop development at the study area. Most of the values of resistance to penetration are lower than 2 MPa, being this value restrictive for root development. The analysis of resistance to penetration profile 0 to 0.60 m shows a compacted layer between 0.20-0.30 m. This compacted layer was caused by the conventional tillage system used at this area before the use of no-tillage system. The soil bulk density has higher values at the upper area, that it shows higher values of soil compaction. Although the values of bulk density and resistance to penetration are high, the area does not show great problems of soil compaction.

Músicas populares urbanas, relaciones de género y persistencia de prejuicios: datos brasileños y españoles a partir de la escucha de cuatro canciones.

Las músicas populares urbanas participan en la construcción, transmisión y deconstrucción de las imágenes de género. Es trascendental comprender su influencia entre los oyentes. Para ello, realizamos una investigación basada en encuestas a jóvenes universitarios que mostró la permanencia de prejuicios y una escasa capacidad crítica, lo que refuerza algunas de las hipótesis de la sociología de la música de T. W. Adorno y plantea cuestiones importantes para la musicología feminista. Es necesario tener conciencia de la existencia de estos prejuicios si pretendemos una educación emancipatoria.

Busca de princípios para uma atuação a partir de estudos sobre o griots africanos e os jograis medievais europeus

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

É, não sou: ensaios sobre os afro-sambas no tempo e no espaço

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)