150 research outputs found
Arrieros maragatos en el siglo XVIII
Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 2009-201
Teaching experience in Geography within The European Higher Education Area-EHEA
El presente artículo presenta la experiencia de formación docente de un grupo de profesores de Geografía de la Universidad de Sevilla, en el marco del Programa de Formación del Profesorado 2009-2010. Los principales objetivos de esta experiencia de formación fueron: analizar el proceso de aprendizaje durante el programa de formación docente, detectar posibles dificultades en el proceso de enseñanza adaptado al Espacio Europeo de Educación Superior (EEES) y, teniendo en cuenta la experiencia, realizar propuestas para la mejora de la docencia en Geografía. La estructura del citado programa de formación se componía de cinco módulos de aprendizaje sobre temas específicos relacionados con la docencia, cuatro sesiones presenciales para resolver dudas, dos cursos de formación, diversas reuniones de coordinación y la grabación de una clase de cada uno de los profesores y su posterior análisis. A pesar de las limitaciones actuales, el EEES supone una oportunidad para la aplicación de nuevas metodologías de trabajo docente, afectando tanto al rol del profesor como del alumno, con nuevas y múltiples posibilidades de trabajo
Identification of water stress conditions in olive trees through frequencies of trunk growth rate
Continuous monitoring of the tree water status will enhance irrigation performance, particularly when applying
deficit schedules. The olive tree is a highly drought-resistant species and management of the water stress could
increase water savings. Trunk diameter fluctuations can be displayed as daily curves representing the shrinkage
and swelling, and can provide information about tree water status. In olive trees, trunk growth rate (TGR) is the
most useful indicator, but the daily variability reduced the commercial applications. Recently, weekly frequencies of TGR values were associated to the water status in one seasonal experiment. The aim of this work is to
study the seasonal pattern and the interannual variations of these parameters in order to integrate them in an
irrigation scheduling tool. The experiment was performed during two consecutive seasons (2018 and 2019) in a
superhigh density mature olive orchard at Carmona (Seville, Spain). Three different irrigation scheduling
treatments were considered in a randomized complete block design. The control treatment was fully irrigated
with 150–175% crop evapotranspiration (ETc) in order to ensure an optimum water status. Regulated deficit
irrigation-1 (RDI-1) was scheduled using only TGR data provided through the continuous measurements from a
dendrometer. In this treatment, water stress conditions were controlled during the pit hardening period. RDI-2
was similar to RDI-1, but with a more severe water stress conditions during pit hardening and a maximum
seasonal amount of water that limited rehydration. Water stress was greater during the 2019 season than the
2018 season, according to the midday stem water potential (SWP). Weekly frequencies of TGR values lower than
− 0.3 mm day− 1 (Severe FR) and values between − 0.1 and 0.3 mm day− 1 (Good FR) described the water status
pattern in the three treatments for both seasons. Only under severe water stress conditions (SWP more negative
than − 4 MPa) the values of these frequencies did not identify accurately the water status. However, the use of
weekly frequencies of values greater than 0.3 mm day− 1 (Alert FR) and the pattern of these Severe FR and Good
FR themselves identified such conditions. The use of these three weekly frequencies (Severe, Good and Alert
(SGA) approach) are suggested for continuous deficit irrigation scheduling in olive trees
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