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EFECTOS DE LA PROFUNDIDAD DE PLANTACIóN Y POBLACIóN DE PLANTAS EN LA CALIDAD Y RENDIMIENTO DE ESPáRRAGO VERDE
González A.,María Inés; del Pozo L.,Alejandro;
Agricultura Técnica , 2003, DOI: 10.4067/S0365-28072003000300001
Abstract: the effect on asparagus (asparagus officinalis l.) yield and quality of three planting depths (10, 20 and 30 cm) and two plant densities (22 222 and 33 333 plants ha-1) was assessed in the sub-humid mediterranean climatic zone of chile. crowns of the cv. uc-157 f1 were transplanted to a volcanic soil in september 1995. the experimental design was a randomized complete block in a factorial arrangement, with four replications. the plots were harvested on a daily basis during five seasons (1997-2001), and the number, weight and diameter of spears were determined after trimming at 18 cm. no interaction was detected between the studied factors on yield and its components. high plant density only increased the yield in the first harvest season (1997), whereas planting depth had an effect during the first four harvest seasons (1997-2000), but this effect disappeared in the fifth harvest season (2001). the maximum commercial yield was obtained during the third harvest season (1999) at the most superficial planting depth (10 cm) with production of 10.2 t ha-1. the number of harvested spears per m2 and the proportion of thin spears (7-17 mm) decreased on increasing planting depth from 10 to 30 cm. the number of utilized buds per plant was greater (p £ 0,05) at the lowest plant density (22,222 plants ha-1) and decreased as planting depth increased from 10 to 30 cm. finally, seven years after planting, the asparagus crown depth was shallower in the three planting depths but continued being different (p £ 0,05).
Developmental Responses of Garlic to Temperature and Photoperiod
del Pozo L.,Alejandro; González A.,María Inés;
Agricultura Técnica , 2005, DOI: 10.4067/S0365-28072005000200001
Abstract: bulb initiation and maturity of four chilean clones of garlic (allium sativum l.) were studied in controlled and field conditions in order to assess temperature and photoperiod requirements of selected clones. the effect of cold storage temperature prior to planting and photoperiod on bulb initiation was assessed in two clones of garlic. in one experiment bulbs were stored at 4, 7, 10, 13 and 16°c for 20, 40 or 60 days, and planted in pots in a heated greenhouse with a 14 h photoperiod. in a second experiment bulbs of the same clones were stored at 4 and 10°c, and room temperature (> 13°c) for 30 days, and later grown in a heated greenhouse with 8, 10, 12, 14 or 16 h of photoperiod. in the field, days from emergence to bulb initiation and to maturity were evaluated in 13 clones planted on six sequential planting dates. percentage of bulbing increased and the number of days from emergence to bulb initiation decreased, as storage temperature decreased and duration of storage increased. plants of studied clones did not form bulbs with photoperiods of 8, 10 or 12 h with any storage temperature. all plants of both clones formed bulbs when photoperiod was over 14 h and storage temperature was 4 or 7oc. a reduction on the period emergence-bulb initiation was observed as planting date was delayed from april to september.
EFECTOS DE LA PROFUNDIDAD DE PLANTACIóN Y POBLACIóN DE PLANTAS EN LA CALIDAD Y RENDIMIENTO DE ESPáRRAGO VERDE Effect of planting depth and plant population on quality and yield of green asparagus
María Inés González A.,Alejandro del Pozo L.
Agricultura Técnica , 2003,
Abstract: Se estudió el efecto de tres profundidades (10, 20 y 30 cm) y dos densidades de plantación (22.222 y 33.333 plantas ha-1) sobre el rendimiento y calidad del espárrago (Asparagus officinalis L.) en la zona climática mediterránea sub-húmeda de Chile. Se trasplantaron coronas del cv. UC-157 F1 a un suelo de origen volcánico en septiembre de 1995. El dise o experimental fue de bloques completos al azar en un arreglo factorial con cuatro repeticiones. Las parcelas fueron cosechadas diariamente durante cinco temporadas (1997-2001), y se determinó el número, peso y diámetro de los turiones después de cortarlos a 18 cm. No se detectó interacción entre los factores en estudio sobre el rendimiento y sus componentes. La densidad de plantas sólo tuvo efecto en la producción de turiones en la primera temporada de cosecha (1997), mientras que la profundidad de plantación tuvo efecto durante las primeras cuatro temporadas (1997-2000), desapareciendo en la quinta temporada de cosecha (2001). El máximo rendimiento comercial se obtuvo en la tercera temporada de cosecha (1999) con la menor profundidad de plantación (10 cm), alcanzando a 10,2 t ha-1 El número de turiones cosechados por m2 y la proporción de turiones delgados (7-17 mm) disminuyó al aumentar la profundidad de plantación desde 10 a 30 cm. El número de yemas utilizadas por planta fue superior (P <= 0,05) en la menor densidad de plantas (22.222 plantas ha-1) y disminuyó al aumentar la profundidad de plantación desde 10 a 30 cm. Finalmente, después de siete a os desde la plantación, la profundidad de las coronas de espárrago disminuyó en las tres profundidades de plantación, pero continúan siendo diferentes (P <= 0,05). The effect on asparagus (Asparagus officinalis L.) yield and quality of three planting depths (10, 20 and 30 cm) and two plant densities (22 222 and 33 333 plants ha-1) was assessed in the sub-humid Mediterranean climatic zone of Chile. Crowns of the cv. UC-157 F1 were transplanted to a volcanic soil in September 1995. The experimental design was a randomized complete block in a factorial arrangement, with four replications. The plots were harvested on a daily basis during five seasons (1997-2001), and the number, weight and diameter of spears were determined after trimming at 18 cm. No interaction was detected between the studied factors on yield and its components. High plant density only increased the yield in the first harvest season (1997), whereas planting depth had an effect during the first four harvest seasons (1997-2000), but this effect disappeared in the fifth harvest season (2001). T
Developmental Responses of Garlic to Temperature and Photoperiod Respuestas en Desarrollo del Ajo a la Temperatura y el Fotoperíodo
Alejandro del Pozo L.,María Inés González A.
Agricultura Técnica , 2005,
Abstract: Bulb initiation and maturity of four Chilean clones of garlic (Allium sativum L.) were studied in controlled and field conditions in order to assess temperature and photoperiod requirements of selected clones. The effect of cold storage temperature prior to planting and photoperiod on bulb initiation was assessed in two clones of garlic. In one experiment bulbs were stored at 4, 7, 10, 13 and 16°C for 20, 40 or 60 days, and planted in pots in a heated greenhouse with a 14 h photoperiod. In a second experiment bulbs of the same clones were stored at 4 and 10°C, and room temperature (> 13°C) for 30 days, and later grown in a heated greenhouse with 8, 10, 12, 14 or 16 h of photoperiod. In the field, days from emergence to bulb initiation and to maturity were evaluated in 13 clones planted on six sequential planting dates. Percentage of bulbing increased and the number of days from emergence to bulb initiation decreased, as storage temperature decreased and duration of storage increased. Plants of studied clones did not form bulbs with photoperiods of 8, 10 or 12 h with any storage temperature. All plants of both clones formed bulbs when photoperiod was over 14 h and storage temperature was 4 or 7oC. A reduction on the period emergence-bulb initiation was observed as planting date was delayed from April to September. Se estudió la bulbificación y maduración de clones de ajo (Allium sativum L.) chilenos bajo condiciones controladas y de campo a fin de determinar los requerimientos de temperatura y fotoperíodo de los clones seleccionados. Se estimó el efecto del almacenaje en frío previo a la plantación y del fotoperíodo en la bulbificación de dos clones de ajo. En un experimento se almacenaron bulbos a 4, 7, 10, 13 y 16°C por 20, 40 ó 60 días, y se plantaron en macetas en invernadero calefaccionado, con 14 h de fotoperíodo. En un segundo experimento se almacenaron bulbos de los mismos clones a 4 y 10°C y temperatura ambiente (>13°C) durante 30 días, y luego se hicieron crecer en invernadero calefaccionado con fotoperíodos de 8, 10, 12, 14 ó 16 h. En el campo, se evaluaron los días desde emergencia a inicio de bulbificación y a madurez en 13 clones plantados en seis fechas consecutivas. El porcentaje de bulbificación aumentó y el número de días desde emergencia a bulbificación disminuyó a medida que la temperatura de almacenaje disminuyó y el tiempo de almacenaje aumentó. Las plantas de los clones estudiados no formaron bulbos con fotoperíodos de 8, 10 ó 12 h, con cualquier temperatura de almacenaje. Todas las plantas de ambos clones formaron bulbos cuando el
Cubiertas Vegetales en Producción Orgánica de Frambuesa: Efectos sobre el Contenido de Nutrientes del Suelo y en el Crecimiento y Producción de las Plantas Cover Crops in Organic Raspberry Production: Effects on Soil Nutrient Content, and Raspberry Growth and Yield
Carlos Ovalle M,María Inés González A,Alejandro del Pozo L,Juan Hirzel C
Agricultura Técnica , 2007,
Abstract: Se realizó un estudio de evaluación y selección de cubiertas vegetales para mejora el manejo de suelos entre las hileras de un huerto orgánico de frambuesa (Rubus idaeus L.). Las cubiertas evaluadas fueron: mezcla de trébol subterráneo (Trifolium subterraneum L.) con trébol balansa (T. michelianum Savi), lotera (Lotus corniculatus L.), trébol blanco (T. repens L.), festuca (Festuca arundinacea Schreb.), mezcla de trébol blanco y festuca, y un testigo sin cubierta vegetal. El ensayo se realizó en Chillán, Chile (36°37’ lat. Sur, 72°00’ long. Oeste), durante dos temporadas. El dise o experimental fue de bloques al azar con cuatro repeticiones. La distancia de plantación entre hileras de frambuesa fue de >3 m y cada parcela experimental tenía una superficie de 60 m2. Las cubiertas que incluyeron trébol blanco solo o en mezcla con festuca presentaron la mayor densidad de plantas (828 y 1788 plantas m-2 en el segundo a o, respectivamente), producción de biomasa (9,3 and10,4 t MS ha-1 a o-1 en el segundo a o, respectivamente) y contribución específica de las especies sembradas (sobre 90 % de contribución de las especies sembradas). La mezcla de especies anuales no tuvo un buen comportamiento, particularmente durante la segunda temporada. Se encontró un claro efecto de las cubiertas sobre el contenido de N y K del suelo; sin embargo, no modificaron el contenido de materia orgánica ni pH del suelo. Las cubiertas que controlaron en mejor forma el crecimiento de las malezas fueron aquellas que incluían festuca y/o trébol blanco A study of the evaluation and selection of cover crops to improve soil management in an organic orchard of raspberry (Rubus idaeus L.) was carried out. The evaluated cover crops were: a mixture of subterranean clover (Trifolium subterraneum L.) and balansa clover (T. michelianum Savi), birdsfoot trefoil (Lotus corniculatus L.), white clover (T. repens L.), fescue (Festuca arundinacea Schreb.), a mixture of white clover and fescue, and a control without vegetation. The trial was conducted in Chillán, Chile (36°37’ S, 72°00’ W), during two seasons. The experimental design was randomized blocks with four replicates. Planting distance between raspberry rows was 3 m, and each experimental plot was 60 m2. Covers that included white clover as a single species and white clover in mixture with tall fescue had the highest plant density (828 and 1788 plant m-2, in the second year, respectively), biomass (9.3 and 10.4 t DM ha-1 yr-1, in the second year, respectively) and specific contribution of the sown species (more than 90% contribution of sown spe
Cubiertas Vegetales en Producción Orgánica de Frambuesa: Efectos sobre el Contenido de Nutrientes del Suelo y en el Crecimiento y Producción de las Plantas
Ovalle M,Carlos; González A,María Inés; del Pozo L,Alejandro; Hirzel C,Juan; Hernaiz,Viviana;
Agricultura Técnica , 2007, DOI: 10.4067/S0365-28072007000300006
Abstract: a study of the evaluation and selection of cover crops to improve soil management in an organic orchard of raspberry (rubus idaeus l.) was carried out. the evaluated cover crops were: a mixture of subterranean clover (trifolium subterraneum l.) and balansa clover (t. michelianum savi), birdsfoot trefoil (lotus corniculatus l.), white clover (t. repens l.), fescue (festuca arundinacea schreb.), a mixture of white clover and fescue, and a control without vegetation. the trial was conducted in chillán, chile (36°37? s, 72°00? w), during two seasons. the experimental design was randomized blocks with four replicates. planting distance between raspberry rows was 3 m, and each experimental plot was 60 m2. covers that included white clover as a single species and white clover in mixture with tall fescue had the highest plant density (828 and 1788 plant m-2, in the second year, respectively), biomass (9.3 and 10.4 t dm ha-1 yr-1, in the second year, respectively) and specific contribution of the sown species (more than 90% contribution of sown species). mixture of annual species did not have a good performance, particularly during the second season. a clear effect of the covers on soil content of nitrogen (n) and potassium (k) was found; however, soil organic matter content and ph were not affected. weed growth was best controlled by the cover crops that included fescue and/or white clover.
Tecnología educativa, medios y recursos de ense anza-aprendizaje Educative technology, teaching-learning means and resources
María Vidal Ledo,Carlos Raúl del Pozo Cruz
Educaci?3n M??dica Superior , 2008,
Abstract:
Machine Learning and Statistical Techniques. An Application to the Prediction of Insolvency in Spanish Non-life Insurance Companies
Zuleyka Díaz,María Jesús Segovia,José Fernández,Eva María del Pozo
International Journal of Digital Accounting Research , 2005,
Abstract: Prediction of insurance companies insolvency has arisen as an important problem in the field of financial research. Most methods applied in the past to tackle this issue are traditional statistical techniques which use financial ratios as explicative variables. However, these variables often do not satisfy statistical assumptions, which complicates the application of the mentioned methods. In this paper, a comparative study of the performance of two non-parametric machine learning techniques (See5 and Rough Set) is carried out. We have applied the two methods to the problem of the prediction of insolvency of Spanish non-life insurance companies, upon the basis of a set of financial ratios. We also compare these methods with three classical and well-known techniques: one of them belonging to the field of Machine Learning (Multilayer Perceptron) and two statistical ones (Linear Discriminant Analysis and Logistic Regression). Results indicate a higher performance of the machine learning techniques. Furthermore, See5 and Rough Set provide easily understandable and interpretable decision models, which shows that these methods can be a useful tool to evaluate insolvency of insurance firms.
Patient preferences and treatment safety for uncomplicated vulvovaginal candidiasis in primary health care
Isabel Del-Cura González, Francisca García-de-Blas González, Teresa Cuesta, Jesús Fernández, Justo M Del-Alamo Rodríguez, Rosa A Escriva Ferrairo, M del Canto De-Hoyos Alonso, Laura Arenas, Ricardo Barrientos, Elisa Wiesmann, Cristina De-Alba Romero, Yolanda Díaz, Ana Rodríguez-Mo?ino, Blanca Teira, Marta del Pozo, Jesús Horcajuelo, María J Rojas Giraldo, Paulino González, Rocío A Vello Cuadrado, Beatriz Uriarte, Jeannet Yepes, Yolanda Sanz, M Iglesias Pi?eiro, Susana Hernández, Fernando Alonso, Ana I González González, Alicia Fernández, Carmen Carballo, Ana López, Fernanda Morales
BMC Public Health , 2011, DOI: 10.1186/1471-2458-11-63
Abstract: This work describes a protocol of a multicentric prospective observational study with one year follow up, to describe the women's reasons and preferences to choose the way of administration (oral vs topical) in the treatment of not complicated candidal vaginitis. The number of women required is 765, they are chosen by consecutive sampling. All of whom are aged 16 and over with vaginal discharge and/or vaginal pruritus, diagnosed with not complicated vulvovaginitis in Primary Care in Madrid.The main outcome variable is the preferences of the patients in treatment choice; secondary outcome variables are time to symptoms relief and adverse reactions and the frequency of recurrent vulvovaginitis and the risk factors. In the statistical analysis, for the main objective will be descriptive for each of the variables, bivariant analysis and multivariate analysis (logistic regression).. The dependent variable being the type of treatment chosen (oral or topical) and the independent, the variables that after bivariant analysis, have been associated to the treatment preference.Clinical decisions, recommendations, and practice guidelines must not only attend to the best available evidence, but also to the values and preferences of the informed patient.Vaginitis is the most frequent reason for gynecology consultation in primary health care services. It is estimated that 75% of women experience at least one episode of vulvovaginal candidiasis throughout her life and 40-50% of them have at least one recurrence [1].The most frequent cause of vulvovaginal inflammation is infective, beeing the main organisms: Gardnerella vaginalis (15-50%), Candida (C) (20-25%) and Trichomonas vaginalis (5-50%) species, with a frequency distribution that depends on the populations studied [2]. Candidal vaginitis is a generic term used for vaginal infections caused by Candida species. Candida albicans is responsible for 90% of vulvovaginal candidiasis; the remaining 10% corresponds to C. glabrata and C
Comparación de indicadores psicológicos y fisiológicos en mujeres hipertensas y enfermeras normotensas
Sandra Cerezo Reséndiz,María del Rocio Hernández Pozo,Raúl Alberto Rivas Lira
Avances en Psicología Latinoamericana , 2010,
Abstract: El objetivo de esta investigación fue comparar indicadorespsicológicos y fi siológicos en 14 mujereshipertensas (grupo 1) y 20 enfermeras normotensas(grupo 2) que laboran en áreas de alto estrés de unhospital de alta especialidad. Material y métodos:se empleó un dise o cuasiexperimental de medidasrepetidas (4); se evaluaron eventos estresantes,distrés, ansiedad conductual, presión arterial,pulso, índice de masa corporal y capacidad físicafuncional. Los resultados muestran diferenciassignifi cativas entre los grupos (prueba Tukey Kramer)en el puntaje total de distrés y la cantidad deeventos negativos (mayor en grupo 1) y de eventospositivos (menor en grupo 1) en las evaluaciones 1y 3. Además, la capacidad física funcional fue másalta en el grupo 1 en las evaluaciones 3 y 4. Discusión:la realización de evaluaciones psicológicas yfi siológicas de forma periódica propicia cambiosde actitud y de conducta, dirigidos hacia el cuidadode la salud física y emocional en poblacionessusceptibles al estrés.
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