Evaluación de la eficiencia de riego por microaspersión en un invernadero de producción de plántulas de hortalizas PDF Download
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Author: José Antonio Campuzano García
Publisher:
ISBN:
Category :
Languages : es
Pages :
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Author: José Antonio Campuzano García
Publisher:
ISBN:
Category :
Languages : es
Pages :
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Author: José Luis Pérez Abelairas
Publisher:
ISBN:
Category :
Languages : es
Pages : 28
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Author: Julio Moraga González
Publisher:
ISBN:
Category :
Languages : en
Pages : 82
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El presente Proyecto de Título surge de la práctica profesional realizada desde diciembre de 1993 a marzo de 1994 en el Depto. de Riego y Drenaje de la facultad de Ingeniería Agrícola, quien desarrollaba un proyecto de Evaluación del Sistema de Riego por Aspersión del Fundo San Isidro, propiedad de Sociedad Forestal Millalemu S.A. Se intenta hacer notar la importancia de una administración adecuada del agua particularmente sobre su mejor distribución y manejo. El objetivo de este estudio es definir el funcionamiento actual del sistema y analizar alternativas que permitan lograr un posible mejoramiento. El análisis considera principalmente la determinación de índices de eficiencia que definen el riego por aspersión dado. Se realizó una caracterización físico-hídrica y de relieve del suelo del vivero y la descripción del equipo de aspersión. Entre los resultados se obtuvo un Coeficiente de Uniformidad de Christiansen de 56,90 por ciento, para el funcionamiento actual del sistema. Si se consideran, además, los valores de otros índices obtenidos se concluye que efectivamente existen deficiencias en el manejo del sistema de riego. Una vez demostradas las eficiencias que existen se sugiere como principal cambio una nueva distribución de los aspersores en cuadrado 18x18 m, además de una serie de consideraciones de manejo, con lo cual se espera mejorar la eficiencia del riego y obtener un Coeficiente de Uniformidad cercano al 80 por ciento definido por la American Society of Agricultural Engineers (ASAE) como un estándar aceptable en riego agrícola.
Author: Marina Roxana Luque Quispe
Publisher:
ISBN:
Category : Microirrigation
Languages : es
Pages : 236
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This study occurred at the Ventilla Ecologic farm, situated in the central Altiplano of Murillo province, 26 km from La Paz. Its objectives were to evaluate two types of irrigation, by drip and by microasperation, in spinach and Swiss lettuce in Walipinis, and to conduct an economic analysis. The genetic material used was spinach (viroflay variety) and Swiss lettuce (large-leaved variety). Chapin irrigation belts and nebulizers were used, and two tensiometers were used to determine the soil moisture. Manual planting occurred on September 1, 2002, in all experimental areas. Seeds were dispersed in a continual flow with Swiss lettuce at a density of 3.5g/m2 and three bobbins, and in spinach the density was 0.26 g/m2 in parallel, 20 cm rows with the irrigation belts on either side. The spinach harvest was spread out, while the Swiss lettuce harvest occurred all at once. A factorial arrangement was used in this study, with two factors: two levels of irrigation (drip and microasperation) and different crops (spinach and Swiss lettuce). The response variables regarding drip irrigation efficiency had a uniformity coefficient of 97%, and microasperation had 85%. The depth reached by the watered bulb after two hours of control was more than 20 cm, while the microasperation only reached 15 cm after two hours. Irrigation occurred at midday but in accordance with the readings that the tensiometers gave. The response variables studied in the crop were: percentage germination, number of leaves, plant size, leaf size, and yield. Yield showed significant differences between types of irrigation of crops. Drip irrigation was better than microasperation. The response variables that had the greatest effect on yield were number of leaves, plant size, and leaf size. The economic production analysis found negative net benefits for the first trial. In the second trial, drip irrigation netted Bs. 3.54/m2 for spinach and Bs. 3.68/m2 for Swiss lettuce, recovering the investment from the first trial. In contrast, the yield from microasperation irrigation, even though the second trial had positive net results, did not recover the investment from the first trial. Finally, based on these data, drip irrigation is recommended because of its better yields and a lower installation cost.
Author: Gerrit van Straten
Publisher: CRC Press
ISBN: 1420059637
Category : Science
Languages : en
Pages : 318
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Greenhouse control system manufacturers produce equipment and software with hundreds of settings and, while they hold training courses on how to adjust these settings, there is as yet no integrated instruction on when or why. Despite rapid growth in the greenhouse industry, growers are still faced with a multitude of variables and no unifying frame
Author: Great Britain
Publisher:
ISBN: 9780111531877
Category :
Languages : en
Pages : 72
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Enabling power: Welfare Reform Act 2007, ss. 2 (1) (a) (c) (4) (a) (c), 3 (1) (c) (2) (b) (d) (3), 8 (1) to (3) (4) (a) (b) (5) (6), 9 (1) to (3) (4) (a) (b), 11A (5), 11B (2) (3), 11D (2) (d), 11E (1), 11H (5) (6), 11J (3) (4) (8), 17 (1) (2) (3) (a) (b), 18 (1) (2) (4), 20 (2) to (7), 24 (1) (2) (b) (3), 25 (2) to (5), sch. 1, paras 1 (3) (4), 3 (2), 4 (1) (a) (c) (3) (4), sch. 2, paras 1 to 4A, 5, 6, 9, 10 & Social Security Administration Act 1992, ss. 5 (1A), 189 (4) to (6), 191 & Social Security Act 1998, s. 21 (1) (a) & Welfare Reform Act 2012, sch. 5, paras 2 (3), 3. Issued: 10.12.2012. Made: -. Laid: -. Coming into force: 29.04.2013. Effect: None. Territorial extent & classification: E/W/S. For approval by resolution of each House of Parliament
Author: Allison Williams
Publisher: Routledge
ISBN: 1317010809
Category : Science
Languages : en
Pages : 399
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Book Description
The therapeutic landscape concept, first introduced early in the 1990s, has been widely employed in health/medical geography and gaining momentum in various health-related disciplines. This is the first book published in several years, and provides an introduction to the concept and its applications. Written by health/medical geographers and anthropologists, it addresses contemporary applications in the natural and built environments; for special populations, such as substance abusers; and in health care sites, a new and evolving area - and provides an array of critiques or contestations of the concept and its various applications. The conclusion of the work provides a critical evaluation of the development and progress of the concept to date, signposting the likely avenues for future investigation.
