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Registros recuperados: 12
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Adaptability and Genotype x Environment Interaction of Spring Wheat Cultivars in Chile using Regression Analysis, AMMI, and SRAG Chilean J. Agric. Res.
Castillo,Dalma; Matus,Iván; del Pozo,Alejandro; Madariaga,Ricardo; Mellado,Mario.
Wheat (Triticum aestivum L.) genetic improvement objectives include obtaining cultivars capable of expressing their maximum potential yield and quality in diverse environments. This make necessary to know and define the environment in which a variety can express its maximum potential yield and quality. The objective of this study was to assess which method is the most efficient to study cultivars response in multiple environments. For this, we analyze the adaptability, stability, and genotype x environment (GxE) interaction effect, grain yield, sedimentation, and wet gluten content of 13 spring wheat cultivars sown in six environments in the central-south and southern zones of Chile during two seasons. The data were analyzed by regression analysis,...
Tipo: Journal article Palavras-chave: AMMI; SREG; GxE; Bread wheat.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200001
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Arrowleaf Clover (Trifolium vesiculosum Savi): A New Species of Annual Legumes for High Rainfall Areas of the Mediterranean Climate Zone of Chile Chilean J. Agric. Res.
Ovalle M,Carlos; del Pozo,Alejandro; Fernández,Fernando; Chavarría,Jorge; Arredondo,Susana.
The present review examines the main attributes and agronomic characteristics of arrowleaf clover (Trifolium vesiculosum Savi) and its incorporation into production systems in dryland areas of the Andean foothills of the humid Mediterranean climate zone of Chile. It is a new species of annual legume in Chile for light and medium textured soils. The root system can reach a depth of 1.5 m and its seeds have a high percentage of hardseedness (99.8%). It is an upright plant, with purplish-white flowers. The mature plant has large arrow-shaped leaves up to 50 mm long, often marked with a large white “V”. Dry matter and seed production in the Andean foothills is high (3.9-8.8 t DM ha-1 and 700-900 kg ha-1, respectively), surpassing the productivity of sub clover...
Tipo: Journal article Palavras-chave: Arrowleaf clover; Annual legume pastures; Dryland Andean foothills; Mediterranean pastures.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100018
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Assessing long- and short-term trends in cereal yields: the case of Chile between 1929 and 2009 Ciencia e Investigación Agraria
Engler,Alejandra; del Pozo,Alejandro.
Cereal grain yields have increased worldwide during the 20th century as a consequence of plant breeding, improved cultural practices and intensive use of inputs. However, there is evidence that there are differences in yield pattern evolution across countries and cereals. The purpose of this study was to compare trends in the yields of the most commonly produced cereals in Chile, namely wheat, oat, barley, maize and rice, to identify similarities in trends across crops and to estimate long-term growth rates in the yields and their changes over time. Data for wheat, barley, oat, rice and maize yields between 1929 and 2009 were obtained from the Chilean Oficina de Estudios y Políticas Agrarias (ODEPA). A first-order autoregressive (AR1) model with trend was...
Tipo: Journal article Palavras-chave: Barley; Oat; Maize; Rice; Wheat; Yield progress.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100005
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Biological Fixation of N2 in Mono and Polyspecific Legume Pasture in the Humid Mediterranean Zone of Chile Chilean J. Agric. Res.
Espinoza,Soledad; Ovalle,Carlos; del Pozo,Alejandro; Zagal,Erik; Urquiaga,Segundo.
Despite annual legume pasture are of great importance for dryland agricultural systems in Mediterranean environments, there are few studies of N2 biological fixation (NBF) reported in Chile. In this study the NBF of four annual legume species: subterranean clover (Trifolium subterraneum L.), yellow serradella (Ornithopus compressus L.), arrow-leaf clover (T. vesiculosum L.), and crimson clover (T. incarnatum L.) (Experiment 1), as well as seven mixtures of these species (Experiment 2) were assessed. The NBF was measured by the 15N natural abundance technique. The objective was to determine NBF in the legume species and in distinct mixtures used. The study was carried out in an Andisol of the Andean Precordillera located in the humid Mediterranean zone of...
Tipo: Journal article Palavras-chave: Natural abundance of 15N; Mediterranean pastures; Volcanic soil.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100016
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Cubiertas Vegetales en Viñedos: Comportamiento de mezclas de Leguminosas Forrajeras Anuales y Efectos sobre la Fertilidad del Suelo Agricultura Técnica
Ovalle,Carlos; del Pozo,Alejandro; Lavín,Arturo; Hirzel,Juan.
Con el objetivo de evaluar y seleccionar cubiertas vegetales como cultivos entre hileras, para mejorar el manejo del suelo en un viñedo (Vitis vinifera L.) cv. Cabernet Sauvignon, se evaluaron cinco cubiertas: a) testigo sin vegetación; b) testigo con vegetación espontánea; c) mezcla de leguminosas de cultivares precoces de trébol subterráneo (Trifolium subterraneum L.) con hualputra (Medicago polymorpha L.); d) mezcla de cultivares tardíos de trébol subterráneo con trébol balansa (T. michelianum Savi); e) mezcla de leguminosas tardías con ballica anual (Lolium rigidum Gaud .) El ensayo se realizó en el Centro Experimental Cauquenes del Instituto de Investigaciones Agropecuarias (INIA), durante dos temporadas, 2005-2006 y 2006-2007. El diseño experimental...
Tipo: Journal article Palavras-chave: Cubiertas vegetales.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000400006
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Días a floración en espinaca (Spinacia oleracea L.) en diversas épocas de siembra: respuesta a la temperatura y al fotoperíodo Agricultura Técnica
González,María Inés; del Pozo,Alejandro; Cotroneo,Daniel; Pertierra,Rosa.
Se evaluaron los días a floración (f) en espinaca (Spinacia oleracea L.) cvs. Baker, Olympia, Shasta y Viroflay, en siembras secuenciales durante 12 meses en el campo experimental del Instituto de Investigaciones Agropecuarias en Chillán (36°32’ lat. Sur, 71°55’ long. Oeste), con el fin de determinar la influencia de la temperatura y del fotoperíodo en la tasa de progreso a floración (<FONT FACE=Symbol>¦</FONT> -1). El tiempo entre siembra y 50% de floración varió entre los 43 y 60 días en los regímenes más inductivos y entre los 131 y 148 días en los regímenes menos inductivos. Los modelos fenológicos que relacionan <FONT FACE=Symbol>¦</FONT> -1 con la temperatura y el fotoperíodo medio explicaron la mayor parte de la variación en...
Tipo: Journal article Palavras-chave: Desarrollo; Fenología; Modelos; Tasa de floración.
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072004000400001
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Drought Tolerance in Recombinant Chromosome Substitution Lines (RCSLs) Derived from the Cross Hordeum vulgare subsp. spontaneum (Caesarea 26-24) × Hordeum. vulgare subsp. vulgare cv. Harrington Agricultura Técnica
Inostroza,Luis; del Pozo,Alejandro; Matus,Iván; Hayes,Patrick.
Grain yield (GY) and drought tolerance of recombinant chromosome substitution lines (RCSLs) derived from the cross between Hordeum vulgareL.subsp. spontaneum (K. Koch) Thell. and H. vulgare L. subsp. vulgare cv. Harrington, were studied in two contrasting environments, one with water stress (WWS) and the other with no water stress (NWS), during three growing seasons, 2004-2005, 2005-2006 and 2006-2007. In the first season 80 RCSLs were sowed and in the following a selection of 13 RCSLs. An a-lattice design was used in all the experiments. With the data of GY obtained in sites WWS and NWS it was calculated the drought sensitivity index (DSI). During 2004-2005 growing season GY varied greatly among locations, reflecting differences in water availability. The...
Tipo: Journal article Palavras-chave: Barley; Drought sensitivity index; Grain yield water stress; Genotype.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000300004
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Genetic Progress in Winter Wheat Cultivars released in Chile from 1920 to 2000 Chilean J. Agric. Res.
Matus,Iván; Mellado,Mario; Pinares,Marcos; Madariaga,Ricardo; del Pozo,Alejandro.
Wheat (Triticum aestivum L.) is the major crop in terms of planted area and presents the largest distribution in the country covering a wide range of climatic regions. This study assesses the changes of various agronomic traits of winter wheat cultivars released in Chile between 1920 and 2000. A total of 117 winter accessions, representing 45 old and 72 modern cultivars were tested in a humid Mediterranean-type climate, with irrigation, in 2003. Old cultivars were those released before 1960 and modern ones were those released after 1960. Principal component (PC) analysis using 10 agronomic traits clearly separate modern from old cultivars of winter wheat. Comparing modern cultivars with old ones, plant height have been reduced by 25.6%, but others traits...
Tipo: Journal article Palavras-chave: Genetic improvement; Grain quality; Mediterranean environment; Old and new cultivars; Principal components; Yield progress.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300001
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Lucerne and other perennial legumes provide new options for rain fed livestock production in the Mediterranean-climate region of Chile Ciencia e Investigación Agraria
Ovalle,Carlos; Espinoza,Soledad; Barahona,Viviana; Gerding,Macarena; Humphries,Alan; del Pozo,Alejandro.
In dryland Mediterranean environments, the productivity of annual legumes is low during autumn and winter, with plant senescence typically beginning by the middle of spring because of low soil water availability. Therefore, the use of deep-rooted perennial legumes may provide an alternative to annual legumes in regions with a soil moisture déficit. We evaluated the germplasm of new perennial legumes with deep rooting systems in two field experiments in the interior drylands of central Chile. In experiment 1, sixteen genotypes of four perennial legume species, nine cultivars (cvs.) of Medicago sativa, two of Hedysarum coronarium, three of Lotus tenuis, and two of Lotus corniculatus were evaluated for three seasons (2012-2014). In experiment 2, eight...
Tipo: Journal article Palavras-chave: Dryland lucerne; Perennial legumes; Mediterranean pastures.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000300014
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Model Validation for Estimating the Leaf Stomatal Conductance in cv. Cabernet Sauvignon Grapevines Chilean J. Agric. Res.
Jara-Rojas,Francisco; Ortega-Farías,Samuel; Valdés-Gómez,Héctor; Poblete,Carlos; del Pozo,Alejandro.
The coupled model of assimilation and stomatal conductance (A-g s) was evaluated to estimate leaf stomatal conductance of a drip-irrigated vineyard (Vitis vinifera L. cv. Cabernet Sauvignon) located in the Pencahue Valley (35º22’ S, 71°47’ W, 150 m.a.s.l.), Maule Region, Chile, during the 2003-2004 and the 2004-2005 growing seasons. Additionally, a calibration of the three parameters mesophyll conductance (g m), maximum specific humidity (Dmax) and coupled factor (f0) was applied on vines growing in 35 L pots. An infrared gas analyzer was used to calibrate and evaluate the A-g s which allowed simultaneous measuring of the leaf net CO2 assimilation (A) and stomatal conductance (g s) in 2 to 3 h intervals of time. The calibration indicated that the g m,,...
Tipo: Journal article Palavras-chave: A-g s model; Photosynthesis; Mesophyll conductance; Stem water potential; Sensitivity analysis.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100011
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Productivity and Persistence of Yellow Serradela (Ornithopus compressus L.) and Biserrula (Biserrula pelecinus L.) in the Mediterranean Climate Region of Central Chile Chilean J. Agric. Res.
del Pozo,Alejandro; Ovalle,Carlos.
The production and sustainability of non-irrigated pastures in the Mediterranean climate region of central Chile is currently limited by the low diversity of valuable species and cultivars of annual forage legumes, able to persist in zones with highly variable annual rainfall, and low fertility or poorly drained soils. In this work, DM production, seed yield, hardseededness and pasture persistence were evaluated for cultivars of yellow serradella (Ornithopus compressus L.) and biserrula (Biserrula pelecinus L.), in field experiments conducted in the subhumid portion of the Mediterranean climate region of Chile. Burr medic (Medicago polymorpha L.) and sub clover (Trifolium subterraneum L.) were used as a reference plants. A remarkable DM production and seed...
Tipo: Journal article Palavras-chave: Annual legumes; Hard-seed; Espinal; Plant density; Seed yield.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300006
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Seedling vigor variation among 80 recombinant chromosome substitution lines (RCSL) of barley (Hordeum vulgare) Ciencia e Investigación Agraria
Inostroza,Luis; Quezada,Celerino; Inostroza,Wladimir; Matus,Iván; Tapia,Maritza; del Pozo,Alejandro.
The seedling vigor of 80 barley recombinant chromosome substitution lines (RCSLs) was measured for selecting high seedling vigor genotypes. The RCSLs were derived from a cross between H. vulgare subsp. spontaneum and H. vulgare subsp. vulgare 'Harrington'. The work was carried out under greenhouse conditions during the summer of 2008. The experimental design was an alpha lattice with 3 replicates. In each replicate, 40 plants were established, distributed in eight polyethylene pots containing sand as substrate, which were fertilized an irrigated. The emergence of seedlings, number of leaves and shoots, dry matter of leaves, shoots and roots and leaf area of fully expanded leaves were measured. In addition, growth indices were calculated: emergence rate,...
Tipo: Journal article Palavras-chave: Plant growth analysis; Relative growth rate; Net assimilation rate; Allometric coefficient.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100013
Registros recuperados: 12
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