6,649 research outputs found
Título: El romancero de Riego
No full textPrecede al tít.: Under the especial Patronage of M. R. M. the Duke of Sussex. -- Los doze triumphos de los doze Apóstoles, con portada propia, mismo pie de imprenta y fecha 1841. -- El apéndice, con portada propia, mismo pie de imprenta y fecha 1842. -- Algunas de las obras con traducción inglesa. -- Aparentemente sólo se llegó a publicar esta Primera parteCopia digital : Biblioteca de Asturias "Ramón Pérez de Ayala" : Biblioteca Pública Estatal de Oviedo, 2010Contiene: Parte I : Los doze triumphos de los doze Apóstoles / fechos por el Cartuxano (Don Juan de Padilla) ; Cánticos entresacados de las tres tablas del Retablo de la vida de Cristo / compuesto por el mismo. Descripción del Aula de Dios, Cartuja de Zaragoza : en dos silvas / Por Don Miguel de Dicastillo. Apéndice, Poesías varias, póstumas, de Don Eugenio Antonio del Riego Núñez, compuestas en los tres o cuatro últimos años de su vida. El romancero de Riego / por Don Benito Pérez, llamado El Botánico de Ovied
Language as a Complex System:
No full textAn XML representation of Japanese texts is introduced that highlights basic syntactical mechanisms common to a wide class of languages
Riego automático en tomate de industria como apoyo a una producción más sostenible
No full textEl objetivo de este trabajo es validar en condiciones de campo la herramienta Irri_Desk para llevar a cabo un sistema de riego automatizado de riego por goteo, en una parcela de tomate de industria ubicada en las Vegas Bajas del Guadiana. Además, se evaluó cómo Irri_Desk consigue producciones rentables con un límite de consumo de agua inferior a 5.000 m³/ha.info:eu-repo/semantics/publishedVersio
Infiltration characteristics of furrow irrigation in a heavy-textured soil
No full textThe objective of this thesis is to study the rate and pattern of infiltration of soil water, under the conditions of heavy texture and shallow depth in a tropical furrow- irrigated soil. The analysis is the result of a series of field-experiments and is supported by theories that has been proposed by others.The experiments were carried out in the Cojedes-Sarare Irrigation Project, Portuguesa State, Venezuela. Furrows with a length of 200 m, spaced at w = 0.70 m, and with an average slope of 0. 18 % were used. Three series of experiments were set out: (i) First series with variable inflow and surface roughness; (ii) Second series with variable initial soil moisture content; (iii) Third series with variable furrow length. Replicates of the treatments were distributed at random.Five irrigations were applied to the land during the period from January to March, 1970. Subsequently in the first series of experiments, first, third and fourth irrigations for three roughness conditions and four sizes of flow were tested. The second irrigation was used for the second series of experiments. The fifth irrigation served for the third series of experiments.During the first series of experiments, the following measurements were taken: (i) rate of advance of the water front (distance x in m at time t in min); (ii) furrow section parameters (top width T and depth h ); (iii) furrow inflow Q and outflow Q out . During the second and the third series of experiments, only the simultaneous inflow and outflow were recorded.Advance and infiltration functions were obtained for the period of advance of the water front (first stage), and infiltration functions for the period of wetting the root zone (second stage). Exponential equations were obtained by computer analysis for single furrow trials. Then, by averaging coefficients and exponents of the equations of the replicates, general equations for each treatment were found.The data of x as a function of t showed a good fit with the equation x = p t r . The coefficient p increased significantly with the flow size Q and the exponent r showed a trend to decrease although not significantly, with increasing Q . The coefficients of variation of p and r were rather high. Therefore a single furrow advance trial may not suffice to express the average field advance of the water front under the given conditions.The advance curves showed that the differences in roughness were great between the first irrigation with loose furrows and those irrigations after two or three applications have taken place. The roughness conditions appeared to be identical for third and fourth irrigations.With distance-averages of the furrow section parameters h and T , for three water front advance stages ( x = 87.5 m, x = 137,5 m and x = 175.0 m), the average section a f , and the average wetted perimeter P were obtained for a parabolic section of the furrows. The surface volume V f = a f p t r , and the area of infiltration A i (net area A in = P pt r and gross area A ig = w pt r ) were then arrived at.The infiltration functions were found for each treatment during the first stage, as V i= f(t) by using single furrow data of V i = Q t - V s ,. As the average infiltration depth I cum = V i / A i , the equations for I cum= f(t) were obtained. Equating these functions with the equation I cum = F at b+1/( b + 1) ( b + 2), the parameters a and b of the Kostiakov equation ( I = a t b ) were derived. For the second stage (when x = L = 175.0 m), the infiltration function was obtained by simultaneous measurements of the inflow and outflow, as infiltration flow: Q i = Q - Q out , from which the parameters of the infiltration equations, were found.The increase of infiltration with inflow size was clearly shown from the data analysis of both stages as being the effect of a larger volume of water. The parameters of the infiltration equation for the first stage altered in successive irrigations.Some emphasis was put on the unit inflow function q0 to relate flow sizes for both stages with length of run and infiltration. Equations for the unit inflow q0 = Q / A i and for unit infiltration flow q i = Q i / A i per unit area, were obtained for each treatment. Then a generalized type of equation was introduced which relates the unit inflow function with the average depth of water infiltrated during the advance time at the furrow intake. An equation to predict the length of advance is included x = φ( Q ) t 0.927, for the surface roughness and soil conditions under which the experiments were carried out. The representation of q0= f(t) and q i = f(t) for both stages, in a composite figure with the advance function as a function of time, provides an illustration of the infiltration process, usable for the design and management of furrow irrigation under the conditions of the experiments.The relationship between the exponent of time in the advance equation and the exponent of time in the infiltration equation was analysed with the data from the experiments. This analysis confirmed that r increases when ( b + 1) decreases. This agrees with findings in the literature, such as the relationship proposed by FOK and BISHOP (1965) Values for the surface storage coefficient C 1 = D / D0 , and infiltration coefficient C 2 = I cum / I cum0 to solve the balance equation for predicting advance were also obtained.The second series of experiments, in which infiltration rate was measured during the second stage, as a function of the initial moisture content, showed that the value of the coefficient a of the Kostiakov equation increased not significantly as the initial content of soil moisture decreases.The third series of experiments - measurements taken during the second stage - showed that upon the increase of furrow length, the coefficient a of the infiltration equation decreases and the exponent b increases.Water losses by deep percolation and by run-off at the end of the run, were finally analysed on the bases of the equations found and the data available. The analysis was made for the case of constant inflow for both stages (third irrigation), and for the case of reduced inflow during the second stage (fourth irrigation).The data analysis showed that infiltration is a very variable factor affected by the conditions of the soil and the surface of the channel bed, as well as by the size of the flow, furrow length and stage of irrigation. Soil cracking upon drying was found to be a relevant factor in the entry of water into the soil. Because deep percolation losses are certainly very small under the indicated physical conditions, irrigation efficiency will be rather high if provisions are made to use a cut-back stream, during the second stage, in order to lose a minimum of water by run-off at the end of the run
An XML Representation of Basic Japanese Grammar
No full textA methodology of natural language grammar representation is introduced, which is based on XML. It is applied to Japanese language. Some intrinsic features of this language are discussed, which seem to be suitable to the proposed methodology
Riego automático en tomate de industria como apoyo a una producción más sostenible
No full textEl objetivo de este trabajo es validar en condiciones de
campo la herramienta Irri_Desk para llevar a cabo un
sistema de riego automatizado de riego por goteo, en una
parcela de tomate de industria ubicada en las Vegas Bajas
del Guadiana. Además, se evaluó cómo Irri_Desk consigue
producciones rentables con un límite de consumo de agua
inferior a 5.000 m³/ha.info:eu-repo/semantics/publishedVersio
Un método para la determinación de las demandas de riego
No full textHa sido tradicional la creencia generalizada en Colombia de que el riego puede ser una práctica complementaria, puesto que la precipitación total anual, en la mayor parte de las regiones agrícolas del país es suficiente para cubrir las necesidades de agua en los cultivos y que solamente aquellos muy intensivos como el de flores para la exportación en la Sabana de Bogotá, o el de caña de azúcar en el Valle del Cauca, justifican la aplicación sistemática del riego. Esto ha conducido a que durante muchos años, en la planificación integral de los recursos hidráulicos del país, al riego se le ha relegado a un segundo o tercer plano. Esta es, quizá, una de las razones por las cuales los distritos de riego, solamente benefician con riego una porción sustancialmente menor a la inicialmente propuesta. Por otra parte, si se analiza detenidamente el concepto de agricultura moderna, en esta actividad, como en cualquiera otra donde se busque optimización de los procesos, no debe dejarse ningún factor de producción sin control, teniendo en cuenta que, en última instancia, la agricultura no es sino la utilización de la radiación solar, abundante en los trópicos durante todo el año, y que la planta representa el sistema de captación y transformación de esa energía en alimentos y materia prima vegetal para la industria. Con un aprovechamiento completo de la radiación solar para un valor equivalente a 500 calarlas por centímetro cuadrado y por día, los científicos han demostrado que se podrían producir hasta unas cien toneladas de materia seca por hectárea y por afta. Esta cifra, obviamente, representa una cifra teórica Ideal, pero se constituye en una meta para científicos e investigadores de la genética vegetal. En la actualidad, para llegar a cifras significativas de productividad, se requiere, además de las variedades más productivas de acuerdo al clima, semillas certificadas, control de plagas y enfermedades, que se provea la planta de un ambiente apropiado en la zona de raíces: esto es agua, oxígeno, nutrientes, etc. De todas las consideraciones anteriores, se concluye que el riego y el drenaje deberían ocupar un lugar importante dentro de la planificación integral de los recursos hidráulicos del país con el fin de lograr un desarrollo más apropiado de la agricultura. Dentro de este objetivo, el conocimiento de las demandas de riego dentro de los cultivos para las principales zonas agrícolas, representa una Información valiosa. Con este trabajo se pretende proponer un método para la estimación de las demandas de riego, aplicado a las condiciones de Colombia que pueda ser de utilidad para quienes tienen que ver con la planificación de proyectos de adecuación de tierras para riego y drenaje
Diseño de un sistema de riego localizado para una plantación de olivar superintensivo situada en Ontinyent (Valencia)
No full text[ES] El objetivo de este Trabajo Fin de Grado (TFG) es la implantación de un sistema de riego localizado y automatizado en la Finca "Casa Bella" situada en el término municipal de Ontinyent (Valencia).
Actualmente, la explotación agrícola está en secano.
La mayor parte del cultivo en la explotación corresponde a la variedad Arbequina y se ha plantado mediante un marco de cultivo superintensivo en espaldera de 4 x 1,5 m. Esta variedad, plantada muy recientemente, requiere de un riego complementario ya que la precipitación anual (inferior a 400 mm/año) del municipio no es suficiente para la viabilidad del cultivo.
En la espaldera, la línea de goteros irá sujeta al alambre, de esta manera la tubería no interferirá en la eliminación de malas hierbas y al mismo tiempo quedará más protegida de posibles daños mecánicos.
Una pequeña parte de la finca, de mayor antigüedad y ya en producción, está plantada con un marco de cultivo de 6x5 m. También se diseñará el sistema de riego para estos olivos con el evidente aumento de producción de aceituna que se obtendrá con el riego
En primer lugar, se determinarán las necesidades de riego del cultivo y los parámetros de riego a nivel de parcela más adecuados, con la ayuda de un estudio del medio físico de la zona de riego. Además, se calcularán y dimensionar las subunidades de riego, la red de distribución y el cabezal de riego, que incluirá el sistema de filtrado, fertirrigación, control y automatización. Las necesidades de agua se cubrirán con el agua proveniente de un pozo cercano ubicado en la parte baja de la finca.[EN] The purpose of this Final Degree Project (TFG) is the implementation of a localized and automated irrigation system in the "Casa Bella" Farm located in the municipality of Ontinyent (Valencia).
Currently, the farm is in dry land.
Most of the cultivation on the farm corresponds to the Arbequina variety and has been planted using a 4x1.5 m2 super-intensive trellis cultivation frame. This variety, planted very recently, requires complementary irrigation since the annual rainfall (less than 400 mm / year) in the municipality is not enough for the viability of the crop.
In the trellis, the dripper line will be attached to the wire, in this way the pipe will not interfere in the elimination of weeds and at the same time it will be more protected from possible mechanical damage.
A small part of the farm, older and already in production, is planted with a 6x5 m2 cultivation frame. The irrigation system for these olive trees will also be designed with the evident increase in olive production that will be obtained with irrigation.
In the first place, the irrigation needs of the crop will be determined, as well as the irrigation parameters, for which a study of the physical environment of the study area has been carried out. In addition, the irrigation subunits, the distribution network and the irrigation head will be calculated and dimensioned, which will include the filtering system, fertigation, control and automation. The water needs will be covered with water from a nearby well located in the lower part of the farm.Revert Bas, M. (2020). Diseño de un sistema de riego localizado para una plantación de olivar superintensivo situada en Ontinyent (Valencia). Universitat Politècnica de València. https://riunet.upv.es/handle/10251/157947TFG
Riego de pastos. Cartilla 7
No full textLa cartilla describe el concepto de riego de pastos, su importancia, frecuencia y los métodos de riego por inundación y por aspersión, las ventajas y limitaciones de cada uno, materiales empleados, maquinaria y procesos empleadosThe book describes the concept of pasture irrigation, its importance, frequency and methods of irrigation by flood and sprinkler, the advantages and limitations of each one, materials used, machinery and processes usedConcepto -- 2. Frecuencia del riego en pastos -- 3. Métodos de riego : por inundación -- Riego por aspersión48 página
Un método para estimar los requerimientos de almacenamiento de agua con fines de riego
No full textSe presenta un método para el cálculo de los requerimientos de almacenamiento con fines de riego para una finca. Este método es aplicable en primera instancia cuando se proyecta regar con riego por aspersión, pero es aplicable a otros métodos de riego haciendo las adaptaciones pertinentes
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