941 resultados para Mancha foliar


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Se presenta un espect??culo teatral-musical basado en la novela Don Quijote de la Mancha llevado a cabo en el Colegio Mar??a Auxiliadora de Santander durante el curso 2004-2005 con alumnos de primer y segundo ciclo de la ESO. La actividad consisti?? en la lectura de varios cap??tulos del Quijote, en la selecci??n de algunos de ellos para su puesta en escena y en la elaboraci??n de los mismos acompa??ados de fragmentos musicales. Como resultado se realiz?? una representaci??n coincidiendo con la celebraci??n del IV aniversario del Centro.

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Se expone el proyecto educativo, basado en las ideas de Freinet, del CP Jardín de Arena, de Alcázar de San Juan (Ciudad Real). Se explica el significado de las actividades complementarias y de los proyectos que desarrollan valores. Se destaca también la importancia de la participación de la comunidad educativa, como eje fundamental de la organización escolar. El artículo forma parte de un dossier titulado: Freinet, hoy.

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An??lisis sobre la posible relaci??n entre el uso de la PDI en el aula y el rendimiento escolar; concretamente, si la introducci??n de las PDI???s ha sido un factor condicionante del rendimiento acad??mico de los alumnos. De forma secundaria, se analizar??n los diferentes usos que se le dan a la PDI y la formaci??n, motivaci??n y opini??n personal del profesorado en relaci??n a la misma.

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Se muestra una experiencia multidisciplinar enfocada a la atenci??n a la diversidad y en concreto a las necesidades educativas especiales (NEE). Esta experiencia se aborda en el enclave de la asignatura del grado de Educaci??n Primaria en la Especialidad de Pedagog??a Terap??utica (PT): educaci??n f??sica, pl??stica y m??sica y su did??ctica en las NEE. Este proyecto parte del convencimiento de que la manera id??nea de atender a la diversidad es mediante la interdisciplinariedad, el trabajo por proyectos y la cooperaci??n, que son los tres grandes ejes que articulan esta experiencia.

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Arbuscular mycorrhizal (AM) fungi have a variety of effects on foliar-feeding insects, with the majority of these being positive, although reports of negative and null effects also exist. Virtually all previous experiments have used mobile insects confined in cages and have studied the effects of one, or at most two, species of mycorrhizae on one species of insect. The purpose of this study was to introduce a greater level of realism into insect-mycorrhizal experiments, by studying the responses of different insect feeding guilds to a variety of AM fungi. We conducted two experiments involving three species of relatively immobile insects (a leaf-mining and two seed-feeding flies) reared in natural conditions on a host (Leucanthemum vulgare). In a field study, natural levels of AM colonization were reduced, while in a phytometer trial, we experimentally colonized host plants with all possible combinations of three known mycorrhizal associates of L. vulgare. In general, AM fungi increased the stature (height and leaf number) and nitrogen content of plants. However, these effects changed through the season and were,dependent on the identity of the fungi in the root system. AM fungi increased host acceptance of all three insects and larval performance of the leaf miner, but these effects were also season- and AM species-dependent. We suggest that the mycorrhizal effect on the performance of the leaf miner is due to fungal-induced changes in host-plant nitrogen content, detected by the adult fly. However, variability in the effect was apparent, because not all AM species increased plant N content. Meanwhile, positive effects of mycorrhizae were found on flower number and flower size, and these appeared to result in enhanced infestation levels by the seed-feeding insects. The results show that AM fungi exhibit ecological specificity, in that different. species have different effects on host-plant growth and chemistry and the performance of foliar-feeding insects. Future studies need to conduct experiments that use ecologically realistic combinations of plants and fungi and allow insects to be reared in natural conditions.

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Twenty-eight field experiments on sandy-loam soils in the UK (1982-2003) are reviewed by relating the extension of the green area duration of the flag leaf (GLADF) by fungicides to effects on yield and quality of winter wheat. Over all experiments mean grain yield = 8.85t ha(-1) at 85% DM. With regards quality, mean values were: thousand grain weight (TGW) = 44.5 g; specific weight (SWT) = 76.9 kg hl(-1); crude protein concentration (CP (N x 5.7)) = 12.5 % DM; Hagberg falling number (HFN) = 285 s; and sodium dodecyl sulphate (SDS)-sedimentation volume = 69ml. For each day (d) that fungicides increased GLADF there were associated average increases in yield (0.144 1 ha(-1) d(-1), se 0.0049, df = 333), TGW (0.56 gd(-1), se = 0.017) and SWT (0.22 kg hl(-1) d(-1), se 0.011). Some curvature was evident in all these relationships. When GLADF was delayed beyond 700 degrees Cd after anthesis, as was possible in cool wet seasons, responses were curtailed, or less reliable. Despite this apparent terminal sink limitation, fungicide effects on sink size, eg endosperm cell numbers or maximum water mass per grain, were not prerequisites for large effects on grain yield, TGW or SWT. Fungicide effects on CP were variable. Although the average response of CP was negative (-0.029%DM/d; se = 0.00338), this depended on cultivar and disease controlled. Controlling biotrophs such as rusts, (Puccinia spp.) tended to increase CP, whereas controlling a more necrotrophic pathogen (Septoria tritici) usually reducedCP. Irrespective of pathogen controlled, delaying senescence of the flag leaf was associated with increased nitrogen yields in the grain (averaging 2.24 kg N ha-1 d(-1), se = 0.0848) due to both increased N uptake into the above ground crop, and also more efficient remobilisation of N from leaf laminas. When sulphur availability appeared to be adequate, fungicide x cultivar interactions were similar on S as for CP, although N:S ratios tended to decline (i.e. improve for bread making) when S. tritici was controlled. On average, SDS-sedimentation volume declined (-0. 18 ml/d, se = 0.027) with increased GLADF, broadly commensurate with the average effect on CP. Hagberg falling number decreased as fungicide increased GLADF (-2.73 s/d, se = 0.178), indicating an increase in alpha-amylase activity.