خيارات البحث
النتائج 1321 - 1330 من 25,115
Consumo de água do lírio asiático em vaso com diferentes substratos | Water consumption of the asian lily in vase with diferent substrata النص الكامل
2007 | 2006
Mello, Rosmary Panno | König, Osvaldo | http://lattes.cnpq.br/2405746065984064 | Peiter, Márcia Xavier | http://lattes.cnpq.br/4072803412132476 | Lopes, Sidinei José | http://lattes.cnpq.br/7533347017859354
The purpose of the present study was to evaluate the water consumption in eight substrata: rice charred shell (CAC), ash of rice burned shell (CZ), coconut fiber (FC), soil of paradise (TP), TP+CAC, TP+CZ, FC+CAC and FC+CZ of Asian lily Orange Pixie in vase cultivation; to establish the best substrata for commercial production. The experiment was developed in the vegetation house of UFSM, Santa Maria, RS, during the period from May 17 to July 22, 2004. The experimental outlining was entirely casual by using 12 repetitions and three plants in each vase to determine the irrigation frequency and the water consumption for each substratum. In order to evaluate these parameters, limits were stipulated from at least 60% and at most 80% of the water retention capacity for the substratum in each vase being daily verified in digital scale. Due to the vegetative growing one vase of each treatment was destructed in five different periods of the lily development in order to readjust the weights of the vases in relation to the water consumption between the limits stipulated, besides establishing the evolution of the dry fitomass on aerial portion, bulbs and roots. The determinations accomplished on substrata were: the substratum density, the total porosity, the aerial space and the water availability as physics characteristics as well as the hydrogen potential, the total tenor of soluble salts and the capacity of cations exchange as chemical characteristics. In the vegetal were determined the height of the plant and of the first flower insertion, the area of the leaf, the size of the leaf, the number of flowers and leafs, the total consumption of water and the irrigation frequency. The results have showed that the Asian lily Orange Pixie in vase adapts for commercial cultivation by using 50% in volume of CAC in the substrata composition with FC and TP. | Este trabalho teve como objetivos avaliar o consumo de água em oito substratos: casca de arroz carbonizada (CAC), cinza da casca de arroz queimada (CZ), fibra de coco (FC), terra do paraíso (TP), TP+CAC, TP+CZ, FC+CAC e FC+CZ de lírio asiático Orange Pixie® cultivado em vaso; definir os melhores substratos para produção comercial. O experimento foi conduzido na casa de vegetação da UFSM, Santa Maria, RS, no período de 17 de maio a 22 de julho de 2004. O delineamento experimental foi inteiramente casualizado, utilizando-se 12 repetições e três plantas por vaso para determinar a freqüência de irrigação e o consumo de água para cada substrato. Para a avaliação destes parâmetros, estipularam-se limites de no mínimo 60 % e no máximo de 80 % da capacidade de retenção de água pelo substrato em cada vaso, verificado diariamente em balança digital. Em função do crescimento vegetativo, efetuou-se a destruição de um vaso de cada tratamento em cinco períodos distintos do estádio fenológico do lírio, a fim de reajustar os pesos dos vasos quanto ao consumo de água entre os limites estipulados, e também determinar a evolução da fitomassa seca da parte aérea , dos bulbos e raízes. As determinações realizadas nos substratos foram: densidade do substrato, porosidade total, espaço aéreo e água disponível como características físicas e, potencial de hidrogênio, teor total de sais solúveis e capacidade de troca de cátions como características químicas. No vegetal foram determinada altura da planta e da inserção da primeira flor, área da folha, tamanho da flor, número de folhas e flores, consumo total de água e freqüência de irrigação. Os resultados evidenciaram que o lírio asiático Orange Pixie® em vaso se adapta para cultivo comercial, utilizando 50 %, em volume, de CAC na composição de substratos com FC e TP. Essa combinação não é a que mais consome água, mas a que exige maior freqüência de irrigações.
اظهر المزيد [+] اقل [-]Agua en los paises andinos y los acuerdos de libre comercio | Water in the Andean countries and free trade agreements (Spanish version) النص الكامل
2007
Solón, Pablo | Rodríguez, Denisse
English version available in IDRC Digital Library:
اظهر المزيد [+] اقل [-]Water quality in a lagoon in the southeast Pampa Region of Argentina | Calidad del agua en una laguna del sudeste pampeano (Argentina) النص الكامل
2007
Fernandez, Carolina | Salerno, Carmen Matilde | Paoloni, Juan Dario | Laurent, Gabriela Cecilia
This work evaluates the chemical and bacteriological qualities of the recreational waters of the Sauce Grande lagoon (Argentina). Samples were taken between March 2002 and December 2003. Ninety-six samples from three sampling stations were analyzed in order to determine the density of aerobic heterotrophic microorganisms, the presence of sulphite-reducing clostridia, and the most probable number of total coliforms, E. coli, fecal enterococci and P. aeruginosa. The water pH, temperature and chemical composition (N-NO3-, PO4(3-), Na+, Ca(++) +Mg++, EC and SAR) were also determined. Statistical analysis shows an increase in the microbial parameters of fecal pollution and in the population of heterotrophic microorganisms during the warmest months, influenced by higher temperatures and the more intensive recreational use. Bacterial count indicated that fecal pollution was statistically lower at the recreational area monitoring station; however, P. aeruginosa, an opportunistic pathogen, was present in higher than permitted densities in all determinations. These results show that, from the physico-chemical point of view, anthropogenic activities do not significantly affect the quality of the resource. | Calidad del agua en una laguna del sudeste pampeano (Argentina). En el presente trabajo se evaluó la calidad bacteriológica y química en aguas de la laguna Sauce Grande (A rgentina). Los muestreos fueron realizados entre marzo de 2002 y diciembre de 2003. Se analizaron un total de 96 muestras provenientes de tres estaciones de monitoreo, determinando: densidad de microorganismos heterótrofos mesófi los, presencia de clostridios sulfito-reductores y número más probable de coliformes totales, Escherichia coli, en terococos fecales y Pseudomo nas aeruginosa. También se efectuaron determinaciones de pH, temperat ura del agua y composición química (N-NO 3 − , PO 4 3 − , Na+, Ca ++ + Mg ++ , CE y RAS). Se observó que en los meses más cálidos se produjo un aumento en los parámetros microbianos indicadores de contaminación fecal y en la población de microorganismos he terotrófos; dicho comportamiento estaría influenciado por el aumento de la temperatura y el mayor uso recreativo del recu rso. El recuento de bacterias indicadoras de contaminación fecal fue menor en la estación de monitoreo donde se encuent ra ubicado el balneario; no obstante, P. aer uginosa, patógeno oportunista, estuvo presente en todas las determinaciones con densidades mayores a los valores permitidos. Desde el punto de vista fisicoquímico, no hay un aporte antropogénico significa tivo de contaminantes que afecten la calidad del recurso | Fil: Fernandez, Carolina. Universidad Nacional del Sur. Departamento de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina | Fil: Salerno, Carmen Matilde. Universidad Nacional del Sur. Departamento de Agronomía; Argentina | Fil: Paoloni, Juan Dario. Universidad Nacional del Sur. Departamento de Agronomía; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina | Fil: Laurent, Gabriela Cecilia. Universidad Nacional del Sur. Departamento de Agronomía; Argentina
اظهر المزيد [+] اقل [-][Water productivity in crops under greenhouse in the Iberian Mediterranean coast] | Productividad del agua en cultivos bajo invernadero en la costa mediterránea
2007
Gallardo, M. | Thompson, R.,Universidad de Almería (España). Escuela Politécnica Superior | Fernández, M.D. | Magna, J.J.
[Implantation of Water Framework Directive in the Ebro Basin [Spain]] | Implantación de la Directiva Marco del Agua en la cuenca del Ebro
2004
Arqued Esquía, V.M. | Coch Flotats, A. (Confederación Hidrológica del Ebro, Zaragoza (España). Oficina de Planificación Hidrológica)
Water interchanges matriz. Analysis by means of the theory of graphs | Matriz de Intercambios de Agua. Análisis mediante la Teoría de Grafos النص الكامل
2003
Velázquez Alonso, Esther
[EN] The aim of this work is to demonstrate the relationships established between an economy’s productive sectors and the water consumption generated during their productive processes. We study de Andalusian reality, region of the South Spain characterized by its scarcity, and we will examine if the excessive dependence on water resources which may occur in some productive sectors might affect not only the conservation and quality of this resource, but also have negative effects upon the stability of the economy itself. A mixed methodology has been used, combining Input-Output analysis with Graphs Theory. We obtain a water Input-Output model and an interrelationship matrix which is analysed by Graphs Theory. The main conclusion is that Andalusian’s economic specialisation does not make a positive contribution water conservation and, moreover, the regional economy’s sustainability might be seriously endangered if the authorities do not take into account water limitations in their economy policy. | [ES] Nos planteamos como objetivo poner de manifiesto las relaciones que se establecen entre los sectores productivos y el consumo de agua que éstos realizan para generar su producción. Aplicamos el estudio a Andalucía, Comunidad Autónoma del sur de España caracterizada por su escasez de agua, y nos preguntamos si la dependencia excesiva de los recursos hídricos que algunos sectores productivos de dicha Comunidad pueden llegar a tener, podría afectar de forma negativa, no sólo a la conservación y a la calidad del recurso, sino también a la sostenibilidad de la propia economía. Utilizamos una metodología mixta en la que combinamos el análisis Input-Output, con el que definimos un modelo de consumo de agua y a partir de él elaboramos una Matriz de Intercambios de Agua, con la Teoría de Grafos, mediante la cual analizamos las relaciones contenidas en dicha matriz. Concluimos que la especialización económica de Andalucía no sólo no contribuye a la conservación del recurso sino que además podría llegar a poner en peligro la propia sostenibilidad de la economía regional si los dirigentes políticos no asumen estas limitaciones hídricas en la definición de su política económica. | SWORD | Velázquez Alonso, E. (2003). Water interchanges matriz. Analysis by means of the theory of graphs. 31-56. https://doi.org/10.7201/earn.2003.01.02 | 56 | 31
اظهر المزيد [+] اقل [-]Los recursos de agua y suelo para la agricultura y el desarrollo rural | Water and soil resources for agriculture and rural development
1999
Paulet Iturri, M.
[Importance of nitrogen-water relation in sowing of Autumn 1997] | La importancia de la relacion nitrogeno-agua en la siembra otono 1997
1998
Anon.
Modelo digital para programar la distribución del agua en los distritos de riego | Digital model for programming water distribution in irrigation districts
1980
León Mojarro, F. Benjamin de
La vida en los charcos de agua dulce de Nueva Esparta (Venezuela) | Life in the fresh water pools of Nueva Esparta (Venezuela) النص الكامل
1961
Margalef, Ramón
36 pages, 15 figures, 2 tables | [EN] In the coastal region and neighboring islans of NE Venezuela, the climate is extremely dry during an important part of the year, and temporary pools are of common occurrence afther the rains. Everywhere in the world, life is such kind of temporary pools is highly interesting, speceially in the regions whre aquatic life is mostly restricted to this sort of transient environments. Collections were made in a number of pools in the islands Margarita (September 1960) and Cubagua (January 1961). [...] | [ES] Los charcos y lagunas que se desecan periodicamente, permaneciendo sin agua durante la estación seca constituyen biótopos sumamente ionteresantes por multiples razones. Su estudio presenta particular incentivo cuanto constituyen el tipo único o predominante de medios adecuados al desarrollo de la vida acuática presentes en una región. [...] | Peer reviewed
اظهر المزيد [+] اقل [-]