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| Registros recuperados: 443 | |
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| Toral,Manuel; Bown,Horacio E; Mañon,Alejandro; Alvarez,José; Navarro-Cerrillo,Rafael. |
| The toppling of young trees considerably reduces the value of the first log in Pinus radiata plantations. Although wind is the main cause of toppling, the quality and type of plants, planting techniques, soil fertility and soil preparation may play an important role in the susceptibility of the species to toppling. This article analyzes the influence of ripping and soil type on the probability of P radiata toppling after severe windstorms in central south Chile. To this aim, pairs of similar trees with and without toppling were selected in 2001 in six soil types with and without soil ripping. Root system differences in toppled versus straight trees were compared to gain better insight into the causes of the phenomenon. Among all root measurements, the... |
| Tipo: Journal article |
Palavras-chave: Ripping; Soil fertility; Tap root; Toppling. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300010 |
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| Puga,Aline P; de Mello Prado,Renato; Mattiuz,Ben-Hur; Wyllyam do Vale,Diego; Fonseca,Ivana M. |
| In general, tropical soils present low concentrations of zinc (Zn), and the deficiency of Zn is recognized as a world nutritional problem for cereal production and human beings. Therefore, the main goal of this study was to assess the effects of different methods of Zn application on the quality of corn and sorghum grains grown in Oxisol. Two experiments were set up in the experimental area of UNESP (campus of Jaboticabal, Brazil). The following nine treatments were applied: three doses of Zn by banded application (seed furrows), three doses of Zn by incorporation into soil (0-20 cm depth), foliar application, seed application, and control (no Zn applied). The treatments were arranged in randomized blocks with four replicates. The contents of Zn,... |
| Tipo: Journal article |
Palavras-chave: Carbohydrate; Protein; Sorghum bicolor; Zea mays L; Zn. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100008 |
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| Bown,Horacio E; Fuentes,Juan-Pablo; Perez-Quezada,Jorge F; Franck,Nicolás. |
| Sclerophyllous shrubs and forests are predominant in semiarid Central Chile and have a long history of degradation by fire, cultivation, firewood extraction and grazing. The aim of this study was to compare the amount and environmental drivers of soil respiration across a disturbance gradient in sclerophyllous ecosystems in the National Reserve Roblería del Cobre de Loncha in Central Chile. In a north-facing toe slope, four disturbance conditions were identified: slightly (D1) and moderately disturbed (D2) sclerophyllous forest, (D3) strongly disturbed thorn scrub and (D4) most disturbed A. caven savanna. Twelve 25×25-m plots (625 m²) were distributed equally across D1, D2, D3 and D4. Soil respiration (Rs), soil temperature (Ts), volumetric water content... |
| Tipo: Journal article |
Palavras-chave: Acacia caven savanna; Disturbance gradient; Sclerophyllous forest; Soil respiration; Thorn scrub. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000100009 |
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| Schnettler,Berta; Sepúlveda,Oriana; Ruiz,Danilo. |
| Sobre la base del debate generado por los alimentos genéticamente modificados, particularmente respecto de los alimentos transgénicos (AT), en los países desarrollados, se determinó la importancia de esta variable en la compra de leche líquida y salsa de tomate en consumidores de Temuco (Región de La Araucanía, Chile) y la existencia de diferentes segmentos de mercado, mediante una encuesta a 400 personas. Utilizando análisis conjunto se determinó que la existencia de modificación genética (MG) fue más importante que la marca y el precio en ambos alimentos. Mediante análisis de conglomerados se distinguieron cinco Grupos, dos de ellos con el 46,8 y 18,8% del total de encuestados. Estos dos Grupos mas numerosos dieron importancia a la existencia de MG, pero... |
| Tipo: Journal article |
Palavras-chave: Alimentos genéticamente modificados; Alimentos transgénicos; Análisis de conjunto; Análisis de conglomerados; Ingeniería genética; Mercadeo. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200006 |
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| Oberpaur,Christel; Fernández,Carolina; Délano,Guillermo; Arévalo,M.Eugenia. |
| The most frequently used substrate for the production of covered root seedlings is peat, the extraction of which is under scrutiny due to its negative environmental impact; however, the use of Sphagnum moss in adequate mixtures constitutes a possible alternative. Lettuce seeds (Lactuca sativa L.) were sown in Polystyrene trays (240 alveoli, 24 cm³) to test four substrates, 50% Sphagnum moss mixed with 50% humus or compost and 60% Sphagnum moss with 40% humus or compost, and commercial peat was used as a control. A dose (2.5 or 3.5 gL-1) of controlled-release fertilizer (CRF) was added to all substrates except for the control mix, and the substrates were subsequently irrigated with or without a fertilizer solution. The study was conducted under shaded... |
| Tipo: Journal article |
Palavras-chave: Compost; Humus; Lettuce; Slow release fertilizer; Sphagnum moss. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300004 |
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| Bugueño,Felipe; Livellara,Nieggiorba; Varas,Fernando; Undurraga,Pedro; Castro,Mónica; Salgado,Eduardo. |
| We studied the effect of four irrigation treatments, expressed as fractions (1.3, 1.0, 0.7 and 0.3) of crop evapotranspiration (ETc), on the growth of young pomegranate plants in central Chile (32°32’ S and 71°06’ W). We evaluated the effect of the four treatments on canopy volume (CV) during two growing seasons. For 28 days during the second growing season, we evaluated soil moisture content (0), the soil-moisture depletion factor (p), trunk cumulative growth (TCG), trunk growth rate (TGR) and maximum daily trunk shrinkage (MDS). We found relationships between CV and TCG and between CV and TGR. There were no differences in MDS among the irrigation treatments. We observed significant water stress in plants in the 0.3 ETc treatment (p =... |
| Tipo: Journal article |
Palavras-chave: Dendrometer; Depletion fraction (p); Canopy volume (CV); Maximum daily trunk shrinkage (MDS); Trunk diameter; Trunk growth rate (TGR); Water stress. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000100005 |
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| Miguel,José A; Melendez,Sandy J; Asenjo,Begoña; Bonilla,Luis M; Ciria,Jesús. |
| In this paper, parameters that describe growth, as a function of the season in which they were born (dry or rainy), are presented for males of the for males of the Brahman breed that were castrated at birth and raised in their native environment in the intense system of the Llano Venezolano. Data are presented for 1,478 Brahman males that were castrated at birth. Of these, 750 were born in the months of June and July (the rainy season) and 728 were born in January and February (the dry season). The animals born during the dry season were heavier up until the beginning of the fattening period; after weaning, the greatest average daily weight gain coincided in both groups during rainy periods when the pasture production was greater. When comparing the... |
| Tipo: Journal article |
Palavras-chave: Bertalanffy model; Brahman cattle; Brody model; Gompertz model; Growth curves; Logistic model; Richards model. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200004 |
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| Marticorena,Marta; Bramardi,Sergio; Defacio,Raquel. |
| Characterization of 31 native populations of maize conserved at the germplasm bank of the PNLA Pergamino Experimental Station, Argentina, was achieved by evaluating 10 quantitative attributes in two different environmental situations. The experimental design generated three-way or three-mode data, repeated observations of a set of attributes for a set of individuals in different conditions. The information was displayed in a three-dimensional array, and the structure of the data was explored using Three-Mode Principal Component Analysis, the Tucker-2 Model. A group of populations was identified that displayed homogeneous behavior in the two environments with respect to the following traits: ear length, prolificacy, grains per meter, yield and 1000 kernel... |
| Tipo: Journal article |
Palavras-chave: Germplasm Bank; Genotype-environment interaction; Tucker-2 Model. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000300008 |
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| Castro,Mónica; Fassio,Claudia; Darrouy,Nicole; Aedo,Marcela; Jorquera,Lorena. |
| In Chile, most avocado orchards have been planted using 'Hass' as the scion variety on seedling rootstocks. This has led to the presence of a large variety of individuals, some of which show, among other characteristics, high productivity and a low degree of biennial bearing cycle in the same growing conditions. The most common method used in other countries to propagate such rootstocks from trees involves severe topping; however, this technique is notably destructive, making it difficult to employ in commercial orchards. With the goal of developing alternate methods for forcing shoot production from the rootstock, we tested two different procedures in July 2002 and March 2003, respectively: wounding in conjunction with the application of 1.1 M or 2.2 M... |
| Tipo: Journal article |
Palavras-chave: Avocado; Basal sprout; Cloning; Cytokinin; Epicormic sprout; Girdling; Rootstock. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000200007 |
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| Öztürk,Burhan; Altuntas,Ebubekir; Yildiz,Kenan; Ozkan,Yakup; Saracoglu,Onur. |
| Recently, plant growth regulators have been used for various purposes in apples. Methyl jasmonate (MeJA) has significant effects on the physiology, postharvest biology, processing, and chemical composition of apples. In the present study, the effects of MeJAMeJa treatments on the physicochemical quality and bioactive compounds (total antioxidant activity, total phenolics, and total anthocyanins) of 'Fuji' apples were investigated. The following doses of MeJa were used: 0 (control); 1; 120; 2,240; and 4,480 mg L-1. The highest geometric mean diameter, fruit mass, flesh firmness and skin thickness were obtained from the 2,240 mg L-1 MeJA treatment. Fruits harvested from control trees exhibited the highest total soluble solids content (TSSC) and pH, whereas... |
| Tipo: Journal article |
Palavras-chave: Apple; Antioxidant; Color; Firmness; Methyl jasmonate; Phenolics. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100018 |
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| Rodovalho,Marcos de Araújo; Mora,Freddy; Santos,Elisangela Mendes dos; Scapim,Carlos Alberto; Arnhold,Emmanuel. |
| Durante la evaluación genética de 169 familias de medios hermanos de maíz-roseta de granos blancos (Zea mays), en el inicio de un programa de mejoramiento genético (Ciclo I) conducido en el sur de Brasil, se detectaron diferencias significativas (p < 0,01) en la sobrevivencia. Consecuentemente, la sobrevivencia se incorporó dentro del programa de mejoramiento. El objetivo principal de este estudio fue examinar parámetros genéticos para la sobrevivencia, y su asociación con otras características agronómicas. Para cumplir con este objetivo se usó un enfoque Bayesiano, vía el algoritmo de Gibbs (para selección de plantas individuales) y algoritmo de cadenas independientes (para la selección de familias). La sobrevivencia (medida como una característica... |
| Tipo: Journal article |
Palavras-chave: Algoritmo de Gibbs; Cadenas independientes; Maíz-roseta de granos blancos; Sobrevivencia; Valores genéticos; Zea mays. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000300008 |
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| Beretta-Blanco,Andrés; Carrasco-Letelier,Leonidas. |
| Soil erosion by rainfall is a process that demands management, both for the prevention of excessive soil erosion and for the protection of the quality of freshwater bodies. Erosion coefficients (K-factors) of the universal soil loss equation (USLE)/revised USLE (RUSLE) model were assigned to 99 mapped Uruguayan soil types at 1:1,000,000 scale. This work developed a linear mixed model (LMM) with 79 soils with assigned K-factors, in which the following variables were considered: soil taxonomy, chemical composition, and parent material. The developed LMM had an R²=0.86, in which the soil taxonomy (p<0.0001), parent material (p=0.0174), clay (p=0.0005) and sand (p=0.017) contents had significant statistical effects. The prediction capacity of this model was... |
| Tipo: Journal article |
Palavras-chave: Soil classification; Parent material; Soil texture; Soil chemistry. |
| Ano: 2017 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100011 |
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| Bown,Horacio E; Mason,Euan G; Clinton,Peter W; Watt,Michael S. |
| Chlorophyll fluorescence responses to a factorial combination of nitrogen (N) and phosphorus (P) supply were measured in five clones of Pinus radiata cultivated in a greenhouse over twenty-four months. Chlorophyll fluorescence measurements were taken at months six (5 clones, 182 plants), nine (2 clones, 68 plants) and eighteen (2 clones, 48 plants). Plant growth in stem diameter, height, leaf area, fascicle mass, length and diameter were found to significantly increase with N and, to a lesser extent, P additions; and these values were greatest when both N and P were combined. Plant growth and fascicle size also varied significantly across clones and were generally consistent with the genotypic growth responses that were observed in the field. Dark (Fv /... |
| Tipo: Journal article |
Palavras-chave: Chlorophyll fluorescence; Quantum efficiency of PSII; Electron transport; Genotype; Nutrient limitation. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300012 |
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| Mora,Freddy; Osmério,Pupim-Junior; Scapim,Carlos Alberto. |
| Se analizó la predicción del efecto de cultivar vía mejor predicción lineal no sesgada (BLUP), de 14 cultivares de algodón (Gossypium hirsutum) establecidos en diferentes localidades de Brasil y Paraguay, en la temporada 2003-2004. BLUP, del rendimiento de cultivares, se comparó con el análisis clásico de estabilidad de los modelos desarrollados por Plaisted y Peterson, Wricke, Annicchiarico y Lin y Binns. Un abordaje Bayesiano a través del algoritmo de cadena independiente (IC), se utilizó como otra medida de comparación. La razón de verosimilitud evidenció diferencias significativas para los efectos de cultivar e interacción genotipo-ambiente. Los criterios de información de Akaike y Bayesiano confirmaron estos resultados. La mayoría de las correlaciones... |
| Tipo: Journal article |
Palavras-chave: BLUP; Estabilidad de cultivares; Interacción genotipo-ambiente; Mejoramiento; Modelos mixtos; Verosimilitud. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000100002 |
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| Şekeroğlu,Ahmet; Gök,Hamdiye; Duman,Mustafa. |
| The present study was conducted to investigate the effects of storage duration and egg shell color on external and internal egg quality traits. Eggs were obtained from 29-week--old ATAK-S layer hybrids reared in a traditional cage system. Storage durations were set as 0, 7, 14, 21 and 28 days. Shell color was classified as dark (59.00-67.99); moderate (68.00-70.99) and light (71.00-79.99) using the ΔΕ values of the eggs. The storage duration significantly affected the egg weight (P≤0.01), specific gravity (P≤0.01), breaking strength (P≤0.01), shell thickness (P≤0.01), shell weight (P≤0.01), surface area (P≤0.01), albumen index (P≤0.01), yolk index (P≤0.01),... |
| Tipo: Journal article |
Palavras-chave: ATAK-S; Brown egg; Hen; Poultry; Quality characteristics. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200015 |
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| Sandoval,Claudio; Terreros,Valeria; Schiappacasse,Flavia. |
| Carnations, Dianthus caryophyllus, have been cultivated in Chile for several decades as a cut flower crop. At the present time, floriculture occupies 2,124 ha, of which 180 ha are devoted to carnations. Almost all carnations produced are sold in the domestic market. Several diseases affect carnations, among them fairyring leaf spot (Cladosporium echinulatum), the most important foliar disease in Chile. Different control alternatives for fairy-ring spot were evaluated on the carnation cv. Sarinah in terms of disease incidence and severity. The study was performed in June-August 2003 with a commercial carnation planting in a greenhouse located in Champa(33° 49' S, 70° 45' W) that in previous growing seasons reported a high incidence of fairyring leaf spot.... |
| Tipo: Journal article |
Palavras-chave: Carnation; Cladosporium; Dianthus caryophyllus; Foliar diseases; Sodium bicarbonate; Trichoderma. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300015 |
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| Toledo,Dayand; Parra,Leonardo; Mutis,Ana; Ortega,Fernando; Hormazábal,Emilio; Quiroz,Andrés. |
| The contents of long-chain fatty acids in non-polar root extracts from 1.6 year-old red clover plants of two cultivars (Superqueli INIA and Quiñequeli INIA) and one experimental line (Syn II Pre III), their relationships with H. obscurus populations, and the stimulant or deterrent effects of the root extracts and of individual fatty acids on the weight gain of H. obscurus were investigated. There was an inverse relationship between the insect population size and the palmitic acid content. The Superqueli INIA cultivar contained the highest palmitic acid content and the lowest insect load. When solutions of either palmitic or oleic acids were individually incorporated into an artificial diet, palmitic acid caused a decrease in weight gain, whereas the effect... |
| Tipo: Journal article |
Palavras-chave: Deterrent; Hylastinus obscurus; Trifolium pratense; Palmitic acid. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000300008 |
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| Registros recuperados: 443 | |
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