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In the Netherlands, the difference between senior general secondary and pre-university education is a major issue in political debates. Educationalists claim that most curriculum programmes, pedagogy and educational materials for secondary education use pre-university as a norm; senior general secondary education is understood as simply a lower level of pre-university education. In this study, differences in learning styles of students from both school levels were examined as well as the moderating role of learning styles in school motivation and performance. Subjects were a convenient sample of 204 students from a secondary school in medium-sized city in the western part the Netherlands. Students’ learning style was measured by the Learning Style Inventory; school motivation and performance were both also measured by self-report items...
In the Netherlands, differences in school motivation and performance between boys and girls are a major issue in political debates. In the first years of secondary education in the Netherlands, boys tend to underachieve and to be disengaged from school. Game-based learning might improve the school motivation and performance of both boys and girls. In two studies with game-based learning, gender differences were examined in students' school motivation and learning outcomes. Both boys and girls showed an increase in motivation and learning outcomes. Only in the second study about a digital role-play citizenship game, boys additionally showed a larger increase in media literacy than girls. This means that game-based learning showed potential to solve the so-called boys problem in Dutch secondary education.
One of the main restrictive aspects of no-tillage is the handling of crop residues during amendment and fertilizer application, since when it is not carried out simultaneously with sowing, it is necessary to distribute these products on the surface to maintain the soil cover. The objective of the present study was to evaluate the operational capacity of a prototype designed with double disks, chisel tine and subsoiler, which allows fertilization at a depth between 0 and 0.30 m. The experimental design was randomized blocks, with seven treatments and four replicates. Behavior of the horizontal and vertical forces, soil area disturbed, work depth and specific resistance were analyzed. The results indicated that the use of double disks in front of the chisels reduces the horizontal force and the disturbed area, but these results do not di...
La labranza del suelo es de gran importancia puesto que altera las propiedades físicas y representa un alto consumo de energía. El objetivo del presente estudio fue medir el área transversal del suelo disturbado, la profundidad de trabajo, el ancho de trabajo, la fuerza de tracción y la resistencia específica para diferentes implementos de labranza, arado de discos, arado de cincel vibratorio y arado de cincel rígido, con tres contenidos de agua (0,05; 0,12 y 0,15 g g-1) y tres velocidades de operación (1,12; y 1,45 1,80 m s-1). El contenido de agua afectó todos los parámetros analizados, especialmente para el arado de discos y el arado de cincel vibratorio. Los resultados muestran que el arado de cincel rígido es energéticamente más eficiente para preparar el suelo, con una resistencia específica baja y una mayor área transversal de s...
La creciente demanda por alimentos ejerce presión sobre los recursos naturales y puede conducir a la ampliación de la frontera agrícola en países en desarrollo. Esto ocurre principalmente en zonas tropicales, en sabanas nativas, con suelos de baja fertilidad y susceptibles a degradación. El manejo de cultivos en esas regiones se basa en recomendaciones generalizadas, sin considerar la variabilidad del suelo, conduciendo a baja eficiencia productiva y alto riesgo de degradación ambiental. Este estudio tuvo como objetivo determinar la variabilidad espacial de propiedades químicas, incluyendo carbono orgánico, pH, acidez intercambiable, aluminio intercambiable, P, Ca, Mg, K y Na en dos Oxisoles con diferentes niveles de intervención agrícola, en Puerto López, Colombia, para generar recomendaciones de manejo sitio-específico. Para el ensay...
La creciente demanda por alimentos ejerce presión sobre los recursos naturales y puede conducir a la ampliación de la frontera agrícola en países en desarrollo. Esto ocurre principalmente en zonas tropicales, en sabanas nativas, con suelos de baja fertilidad y susceptibles a degradación. El manejo de cultivos en esas regiones se basa en recomendaciones generalizadas, sin considerar la variabilidad del suelo, conduciendo a baja eficiencia productiva y alto riesgo de degradación ambiental. Este estudio tuvo como objetivo determinar la variabilidad espacial de propiedades químicas, incluyendo carbono orgánico, pH, acidez intercambiable, aluminio intercambiable, P, Ca, Mg, K y Na en dos Oxisoles con diferentes niveles de intervención agrícola, en Puerto López, Colombia, para generar recomendaciones de manejo sitio-específico. Para el ensay...
Human intervention in agricultural production affects directly soil quality by promoting changes in physical and chemical properties through the use of fertilizers, correctives and tillage practices (Brachiria and corn- soybean). The aim of this study was to evaluate changes in the chemical properties of two Oxisols (Typic Hapludox y Typic Haplustox) with different intervention levels, in the municipality of Puerto Lopez (Meta-Colombia). Samples were taken at 42 points, spaced 25 m perpendicularly between 0-0, 10 my 0.10 and 0.20 m of deep, for a total of 168 samples in both fields. The data were analyzed by analysis of variance and multivariate analysis techniques, including principal component and cluster analysis. The properties studied were organic carbon, pH, exchangeable acidity, exchangeable aluminum, P, Ca, Mg, P, Na, effective...
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