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Search Results: 1 - 10 of 462036 matches for " A. Razeto "
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EFECTO DE DIFERENTES FERTILIZANTES POTáSICOS EN EL CONTENIDO FOLIAR DE NUTRIENTES, PRODUCCIóN Y CALIDAD DE FRUTA EN NARANJO cv. VALENCIA
Opazo A.,José Domingo; Razeto M.,Bruno;
Agricultura Técnica , 2001, DOI: 10.4067/S0365-28072001000400009
Abstract: the orange (citrus sinensis (l.) osbeck) has high potassium requirements. nutritional studies in chile have identified orange orchards with foliar contents below the critical level (7.0 g kg-1). the objectives of this study were to evaluate the potassium fertilizers kcl, kno3, k2so4 and k-mgso4 (double salt of potassium and magnesium) and to determine their effects on fruit quality and yield after three years of annual applications. eighteen-year-old orange trees (cv. valencia) grown on la rosa series soil classed as mollisol were used. conventional furrow irrigation with three furrows between the rows was employed. the initial average leaf k concentration was 5.7 g kg-1, which corresponds to a low level. the available k level in the soil was medium, from 0 to 20 cm in depth, and low, from 20 to 40 cm. the foliar k content increased in the second year in the kno3 and k2so4 treatments and in the third year in all the treatments with regard to the control. the highest k concentration was obtained with kno3 (6.8 g kg-1). k-mgso4 increased mg concentration from a low (2.1 g kg-1) to an optimum level (2.6 g kg-1). kcl raised the content of foliar chloride from 0.11 to 0.15 g kg-1. no increment occurred in fruit yield but fruit size did increase. treatments with potassium also increased juice acidity.
EFECTO DE DIFERENTES FERTILIZANTES POTáSICOS EN EL CONTENIDO FOLIAR DE NUTRIENTES, PRODUCCIóN Y CALIDAD DE FRUTA EN NARANJO cv. VALENCIA Effects of different potassium fertilizers on foliar content of nutrients, yield and fruit quality in orange trees cv. Valencia
José Domingo Opazo A.,Bruno Razeto M.
Agricultura Técnica , 2001,
Abstract: El naranjo (Citrus sinensis (L.) Osbeck) tiene altos requerimientos de potasio. Los estudios nutricionales en Chile han identificado huertos con contenidos foliares bajo el nivel crítico (7,0 g kg-1). Los objetivos del estudio fueron evaluar distintos fertilizantes potásicos: KCl, KNO3, K2SO4 y K-MgSO4 (sal doble de potasio y magnesio) y determinar los efectos en la calidad y rendimiento de fruta luego de tres a os de aplicación. Se utilizaron árboles cv. Valencia, de 18 a os, plantados en un suelo correspondiente a la Serie La Rosa, clasificado como Mollisol. El riego correspondía al convencional por surcos, tres surcos entre las hileras. La concentración promedio de K foliar inicial fue de 5,7 g kg-1, el cual es un nivel bajo. El nivel de K disponible en el suelo era medio a 0-20 cm y bajo a 20-40 cm de profundidad. El contenido foliar de K se incrementó en el segundo a o en los tratamientos KNO3 y K2SO4 y en el tercer a o en todos los tratamientos, con respecto al testigo. La concentración de K más alta se obtuvo con KNO3 (6,8 g kg-1). El K-MgSO4 incrementó la concentración de Mg de un nivel bajo (2,1 g kg -1) a un nivel óptimo (2,6 g kg-1). El KCl incrementó el contenido de cloruro foliar de 0,11 a 0,15 g kg-1. No se presentó incremento en rendimiento de fruta, pero sí en el tama o de ésta. Los tratamientos con K produjeron un aumento en la acidez del jugo. The orange (Citrus sinensis (L.) Osbeck) has high potassium requirements. Nutritional studies in Chile have identified orange orchards with foliar contents below the critical level (7.0 g kg-1). The objectives of this study were to evaluate the potassium fertilizers KCl, KNO3, K2SO4 and K-MgSO4 (double salt of potassium and magnesium) and to determine their effects on fruit quality and yield after three years of annual applications. Eighteen-year-old orange trees (cv. Valencia) grown on La Rosa series soil classed as Mollisol were used. Conventional furrow irrigation with three furrows between the rows was employed. The initial average leaf K concentration was 5.7 g kg-1, which corresponds to a low level. The available K level in the soil was medium, from 0 to 20 cm in depth, and low, from 20 to 40 cm. The foliar K content increased in the second year in the KNO3 and K2SO4 treatments and in the third year in all the treatments with regard to the control. The highest K concentration was obtained with KNO3 (6.8 g kg-1). K-MgSO4 increased Mg concentration from a low (2.1 g kg-1) to an optimum level (2.6 g kg-1). KCl raised the content of foliar chloride from 0.11 to 0.15 g kg-1. No increment occurre
RESPONSE OF HYDROPONIC LETTUCE CULTIVARS TO DIFFERENT TREATMENTS OF NITROGEN: GROWTH AND FOLIAR NITRATE CONTENT
Lastra,Olga; Tapia,María Luisa; Razeto,Bruno; Rojas,Mainor;
Idesia (Arica) , 2009, DOI: 10.4067/S0718-34292009000100010
Abstract: the nitrogen requirements of lettuce (lactuca sativa l.) cultivars for obtaining plants of a high phenotypical quality and low nitrate foliar content were studied in this research. butterhead (divina and prima cvs.) and loose-leaf (grand rapids and brisa cvs.) lettuces were grown in a modified hydroponic floating system. plants were subjected to four treatments differential of nitrogen and are in mg of nitrogen l-1: solution 1: 100 no3- -n; solution 2:150 no3--n and 50 nh4+ -n; solution 3: 200 no3--n and 100 nh4+-n; solution 4: 250 no3- -n and 150 nh4+ -n meanwhile as base solution was used modified hoagland ii solution. cultivar responses to treatments were different so much in growth as foliar nitrate content. while the greatest growth was observed in‘grand rapids’ and ‘brisa’ in solution 1 with the lowest nitrogen content in which no3- -n only was supplied, the opposite was observed in ‘divina’ and ‘prima’ in solution 4 and where no3-and nh4+ were supplied. these results showed that the nutritional requirements cultivars are different. moreover, greatest plant growth was observed in cultivars where the foliar nitrate content was highest. high levels of nitrate in vegetable crops have been associated with human health problem. the four cultivars in all treatments showed foliar nitrate contents below the limits established by the european commission legislation. this study permit to optimize the growth under such conditions.
RESPONSE OF HYDROPONIC LETTUCE CULTIVARS TO DIFFERENT TREATMENTS OF NITROGEN: GROWTH AND FOLIAR NITRATE CONTENT RESPUESTA DE LA LECHUGA HIDROPóNICA A DISTINTOS TRATAMIENTOS DE NITRóGENO: CRECIMIENTO Y CONTENIDO DE NITRóGENO EN LAS HOJAS
Olga Lastra,María Luisa Tapia,Bruno Razeto,Mainor Rojas
IDESIA , 2009,
Abstract: The nitrogen requirements of lettuce (Lactuca sativa L.) cultivars for obtaining plants of a high phenotypical quality and low nitrate foliar content were studied in this research. Butterhead (Divina and Prima cvs.) and loose-leaf (Grand Rapids and Brisa cvs.) lettuces were grown in a modified hydroponic floating system. Plants were subjected to four treatments differential of nitrogen and are in mg of nitrogen L-1: solution 1: 100 NO3- -N; solution 2:150 NO3--N and 50 NH4+ -N; solution 3: 200 NO3--N and 100 NH4+-N; solution 4: 250 NO3- -N and 150 NH4+ -N meanwhile as base solution was used modified Hoagland II solution. Cultivar responses to treatments were different so much in growth as foliar nitrate content. While the greatest growth was observed in‘Grand Rapids’ and ‘Brisa’ in solution 1 with the lowest nitrogen content in which NO3- -N only was supplied, the opposite was observed in ‘Divina’ and ‘Prima’ in solution 4 and where NO3-and NH4+ were supplied. These results showed that the nutritional requirements cultivars are different. Moreover, greatest plant growth was observed in cultivars where the foliar nitrate content was highest. High levels of nitrate in vegetable crops have been associated with human health problem. The four cultivars in all treatments showed foliar nitrate contents below the limits established by the European Commission Legislation. This study permit to optimize the growth under such conditions. En esta investigación se estudiaron los requerimientos de nitrógeno de los cultivos de lechuga para obtener plantas de alta calidad fenotípica y bajo contenido de nitrógeno en sus hojas. Dos tipos de lechugas (Divina and Prima cvs y Grand Rapids and Brisa cvs) fueron cultivadas en un sistema hidropónico modificado. Las plantas fueron sujetas a cuatro tratamientos diferenciales de nitrógeno y están en mg de nitrógeno L-1: solución 1: 100 NO3- -N; solución 2:150 NO3--N y 50 NH4+ -N; solución 3: 200 NO3--N y 100 NH4+-N; solución 4: 250 NO3- -N y 150 NH4+ mientras que como base se usó una solución modificada de Hoagland II. Las respuestas de los cultivos a los tratamientos fueron diferentes tanto en crecimiento como en contenido de nitrato en las hojas. Mientras que se observó un mayor crecimiento en las ‘Grand Rapids’ y ‘Brisa’ en la solución 1 con el más bajo contenido de nitrógeno en el cual sólo el NO3- -N fue aplicado, se observó lo opuesto en ‘Divina’ y ‘Prima’ en la solución 4 donde NO3- y NH4+ fueron aplicadas. Estos resultados mostraron que los requerimientos nutricionales para los cultivos son diferentes. Además, un mayor cre
Activación social y desarrollo integral: Análisis de una experiencia de promoción de la acción colectiva a nivel comunal
Hanny Suckel A.,Jorge Razeto M.,Hugo Marchant G.
Ultima Década , 1997,
Abstract:
Desarrollo económico y economía de solidaridad. El desarrollo como expansión, transformación y perfeccionamiento de la economía en el tiempo.
Luis Razeto
Polis : Revista de la Universidad Bolivariana , 2001,
Abstract:
Efecto de la clorosis férrica en el tam?o y la concentración de aceite en el fruto del palto (Persea americana Mill.)
Razeto,Bruno; Palacios,Johanna;
Agricultura Técnica , 2005, DOI: 10.4067/S0365-28072005000100013
Abstract: in order to determine the effect of iron chlorosis on fruit size and oil content, of avocado (persea americana mill.) a trial was conducted on a 22-year-old orchard cv. hass located at quillota, chile (32o51? s lat., 71o6? w long.). twelve trees with different degrees of iron chlorosis were selected, normal green foliage and others highly chlorotic. fifteen fruit and 30 leaves per tree were taken on august 30. in this samples iron concentration was determined by spectrophotometry. color by tri-stimulus colorimetry and chlorophyll concentration by ethanol extraction and spectrophotometer absorbance were measured on leaves and fruit peels. fruit weight and oil content were measured by petroleum ether extraction. fruit from normal trees had an iron concentration of 13.8 mg kg-1 (p £ 0,05) higher than that of chlorotic trees. a high correlation between the chlorophyll level of leaves and fruit peels was found (r2 = 0.74). the leaf chlorophyll concentration was also highly associated with the fruit weight (r2= 0.93) and oil content (r2 = 0.68).a similar relation was found between the fruit peel chlorophyll concentration and the fruit weight (r2 = 0.70) and its oil content (r2 = 0.86). it is concluded that iron chlorosis diminished fruit size and oil concentration in avocados.
El debate sobre las necesidades, y la cuestión de la "naturaleza humana": (Teniendo como trasfondo la interrogante sobre la posibilidad de una nueva civilización)
Razeto M,Luis;
Polis (Santiago) , 2009,
Abstract: this paper addresses the philosophical question of human nature, whose answer depends on the possibility of changing economic, political and social rights, more or less profound and widespread. in this context, we will examine the behavior of the modern consumer, whose needs, aspirations and desires and how to meet them now, seem to constitute an insurmountable obstacle for generating such processes of change. if the mode of being of the modern consumer would be fair and consistent expression of human nature, it would be unrealistic to pretend an ethical refinement that could make viable a new and higher civilization. to answer the question, an analysis of human needs and the various theories that conceptualize it in such terms to justify the economic institutions that domínate modern societies, is undertaken. a new conception of human needs, based on a philosophical rethinking of "human nature" will lead to a new way of conceiving the processes of human development, both at personal as well as at social and civilizatory level.
Un análisis alternativo de la actual crisis económica global y sus vías de superación
Razeto M,Luis;
Polis (Santiago) , 2008, DOI: 10.4067/S0718-65682008000200010
Abstract: it is examined in this article the current global economic crisis, from an alternative point of view, and distant from the visions that domínate among conventional economic analysts, as well as of those interpretations that offer some "alternative" thinkers. the author -basing himself on what he calis "comprehensive economic theory"- argües that essentially this crisis is rooted in a distortion of the prevailing monetary system at global level, which is signifying that money has lost its capacity of complying its essential functions. he argües then that the keynesian politics by which it is sought at present to face this crisis, far from contributing to surpass it will accentuate it and prolong it, until a new monetary system is established, in the context of structuring the market in a different way, which will not oceur until large political, legal, institutional, and cultural reforms are fulfilled.
El debate sobre las necesidades, y la cuestión de la "naturaleza humana" (Teniendo como trasfondo la interrogante sobre la posibilidad de una nueva civilización)
Luis Razeto M.
Polis : Revista de la Universidad Bolivariana , 2009,
Abstract: En el artículo se aborda la cuestión filosófica de la "naturaleza humana", de cuya respuesta depende la posibilidad de cambios económicos, políticos y sociales, más o menos profundos y extendidos. En tal contexto, se parte examinando el comportamiento del consumidor moderno, cuyas necesidades, aspiraciones y deseos y el modo de satisfacerlos actualmente, parecieran constituir un obstáculo insalvable para generar tales procesos de cambio. Si el modo de ser del consumidor moderno fuese expresión cabal y coherente de la naturaleza humana, sería utópico pretender un perfeccionamiento ético que viabilice una nueva y superior civilización. Para responder la cuestión, se efectúa un análisis de las necesidades humanas y de las distintas teorías que las conceptualizan en términos tales que justifican las instituciones económicas que predominan en las sociedades modernas. Una nueva concepción de las necesidades humanas, fundada en una reformulación filosófica de la "naturaleza humana" esencial, conducen a una nueva forma de concebir los procesos de desarrollo humano, tanto a nivel personal como social y civilizatorio.
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