Do cover crop mixtures improve soil physical health more than monocultures?

Rationale and Purpose — Adding multispecies cover crop (CC) mixtures could diversify the current simplified crop rotations and enhance soil health more than monoculture CCs. Further, CC mixtures with diverse plant species could adapt better to changing climatic and environmental conditions than monoculture CCs. However, our current understanding of the soil benefits of CC mixtures is still limited. This review discussed whether CC mixtures are better than monoculture CCs to improve soil physical health. Methods — All studies published up to May 25, 2023, comparing soil physical properties between CC mixtures and their constituents grown as monocultures were searched in the available databases. To avoid potential sampling bias, only studies that compared mixtures against all its constituents grown alone were discussed. Results — Cover crop mixture studies on soil physical properties were relatively few. Mixtures did not reduce soil bulk density in 83% of cases, penetration resistance in 75%, wet aggregate stability in 67%, and dry aggregate stability and saturated hydraulic conductivity in 100% compared with monoculture CCs. Mixtures had inconsistent effects on water infiltration and plant available water. The number of CC species in the mixture and management duration do not differently affect mixture impacts. The limited or no differences in soil physical properties between mixtures and monocultures could be due to the similarities in CC biomass production and soil C between these two systems. Conclusion — Cover crop mixtures do not enhance soil physical properties relative to monoculture CCs in most cases. However, the few cases where mixtures outperformed monocultures suggest soil benefits of mixtures should be evaluated on a site-specific basis. More long-term (\u3e 10 yr) data are needed for more definitive conclusions. Highlight — Cover crop mixtures do not generally improve soil physical health more than monoculture CCs

Atenuación pragmática y problemas de intercomprensión: un estudio intercultural entre paulistanos y cordobeses

IX Congresso Brasileiro de Hispanistas realizado nos dias 22 a 25 agosto 2016En esta comunicación expondremos los resultados de un trabajo de investigación intercultural realizado dentro del programa de postgrado de la USP (Universidade de São Paulo) en el cual se efectuó una comparación de las tácticas de atenuación pragmática de actos de habla amenazadores de la imagen de los interactantes, específicamente de enunciados asertivos no corteses y repuestas no preferidas. La investigación se llevó a cabo a partir de corpora obtenidos mediante tests de hábitos sociales con estudiantes universitarios de las ciudades de San Pablo (Brasil) y Córdoba (Argentina). Para el análisis comparativo se emplearon las categorías sistematizadas en la ficha de procedimientos de atenuación elaborada por el proyecto ES.POR.ATENUACIÓN, que busca establecer bases teóricas y metodológicas comunes de análisis en las diferentes normas regionales del español y el portugués. Explicitaremos también cómo las diferencias arrojadas por este estudio bien pueden ser explicadas a la luz de los conceptos de sociedades de aproximación y distanciamiento, propuestos por Haverkate (2004), Briz (2005) y Albelda y Briz (2010). Asimismo veremos cómo los procedimientos lingüísticos de atenuación empleados por los estudiantes paulistanos al elaborar los enunciados, crearon cambios semánticos que comprometieron la interpretación realizada por los estudiantes de Córdoba, originando posibles problemas de comprensión entre ellosUNILA­-UNIOEST

PERCEIVED SELF-EFFICACY IN THE SOCIOCULTURAL SPHERE WITH MEXICAN UNIVERSITY STUDENTS. DIFFERENCES BETWEEN MEN AND WOMEN

The aim of the present study was to compare the profiles of perceived self-efficacy in the sociocultural sphere between men and women university students. A total sample of 2,089 participants, 902 women and 1,187 men (average age = 18.23 ± .74 years) participated in this study. A quantitative approach with a descriptive and transversal survey design was applied. The results of the one-way multivariate analysis of variance, followed by the oneway univariate analyses of variance, showed that women reported statistically significant higher punctuations than men regarding the perceived self-efficacy in the promotion of culture and cultural identity (p < .001). Therefore, gender is an important variable when designing any kind of intervention for improving the perceived self-efficacy of students in a sociocultural sphere. Future research should apply these findings within other cultures

Servicios de datos de investigación en la Universidad del Rosario

Temas: - Datos de investigación - Políticas de investigación - Repositorio de datos de investigación - BenchmarkingIbero-American Science and Technology Education Consortiu

Servicios de datos de investigación en la Universidad del Rosario

Temas: - Datos de investigación - Políticas de investigación - Repositorio de datos de investigación - BenchmarkingIbero-American Science and Technology Education Consortiu

La normalización, un factor determinante para la interoperabilidad: caso repositorios colombianos

La muestra de los repositorios de esta primera fase abarcó a los 14 repositorios publicados en la página web de la Red Universitaria Metropolitana de Bogotá – RUMBO, más el repositorio de la Universidad de la Sabana. Validación cumplimiento de criterios de uso OAI-PMH según OPENAIRE 3.0 Cumplimiento del Set Openaire o SNAAC. Recomendaciones para los administradores de repositorios.Ibero-American Science and Technology Education Consortiu

La normalización, un factor determinante para la interoperabilidad: caso repositorios colombianos

La muestra de los repositorios de esta primera fase abarcó a los 14 repositorios publicados en la página web de la Red Universitaria Metropolitana de Bogotá – RUMBO, más el repositorio de la Universidad de la Sabana. Validación cumplimiento de criterios de uso OAI-PMH según OPENAIRE 3.0 Cumplimiento del Set Openaire o SNAAC. Recomendaciones para los administradores de repositorios.Ibero-American Science and Technology Education Consortiu

Servicios de datos de investigación en la Universidad del Rosario

Temas: - Datos de investigación - Políticas de investigación - Repositorio de datos de investigación - BenchmarkingIbero-American Science and Technology Education Consortiu

La normalización, un factor determinante para la interoperabilidad: caso repositorios colombianos

La muestra de los repositorios de esta primera fase abarcó a los 14 repositorios publicados en la página web de la Red Universitaria Metropolitana de Bogotá – RUMBO, más el repositorio de la Universidad de la Sabana. Validación cumplimiento de criterios de uso OAI-PMH según OPENAIRE 3.0 Cumplimiento del Set Openaire o SNAAC. Recomendaciones para los administradores de repositorios.Ibero-American Science and Technology Education Consortiu

Predicting soil wind erosion potential under different corn residue management scenarios in the central Great Plains

Various models and simplified equations are available to predict wind erosion potential. However, their performance can be often site-specific, depending on soil characteristics and agronomic practices, warranting sitespecific model validations. Thus, in this study, we 1) validated the wind erodible fraction (WEF) predictive equations by Fryrear et al. (1994) and López et al. (2007) and 2) estimated the total soil loss with the Singleevent Wind Erosion Evaluation Program (SWEEP) using 3-yr measured data from six experiments located across a precipitation gradient in the central Great Plains. Each site had three corn (Zea mays L.) residue removal treatments: control (no removal), grazed, and baled. The measured and predicted WEF were significantly correlated. While the Fryrear et al. (1994) equation performed better than the López et al. (2007) equation, it underestimated WEF with 59% uncertainty across site-years. To reduce this underestimation and uncertainty, we developed a new statistical equation (WEF%=84.3+2.64×% silt-0.30×% clay-7.43×% organic matter- 0.15×% residue cover; r2=0.56). The predictive ability of the new equation was, however, no better than that of the existing predictive equations, suggesting the need for further refinement of WEF equations for the region. Simulated total soil loss by wind using the SWEEP model indicated that corn residue baling may increase soil loss if residue cover drops below 20% in the study region. Overall, the existing WEF equations could under- or overestimate WEF based on site-specific residue management, warranting further model refinement and site-specific validation, whereas the SWEEP estimated soil loss corroborates the critical importance of maintaining sufficient residue cover (\u3e 20%) to reduce wind erosion