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| Registros recuperados: 7.826 | |
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| Muñoz,Alejandra E; Simonetti,Javier A. |
| Guanaco (Lamaguanicoe), the only native ungulate of Tierra del Fuego, uses the forests more extensively after the introduction of sheep. It is presumed that the regeneration of lenga (Nothofagus pumilio) is hampered by guanaco browsing. In this context, the diet of guanaco in Tierra del Fuego was evaluated through a microhistological analysis of feces in a livestock-free area dominated by lenga forest. Guanacos behaved largely as herbivorous grazers and exhibited seasonal variations in their grazing habits. Compared to other studies in Tierra del Fuego, which were conducted in areas where sheep and guanaco grazed together, we reported that the guanacos avoided and consumed fewer trees. These results have management implications, as the proper management of... |
| Tipo: Journal article |
Palavras-chave: Lama guanicoe; Nothofagus pumilio; Feeding habits; Microhistological analysis. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100016 |
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| Schnettler,Berta L; Rebollo,Alfonso. |
| La desigual distribución del equipamiento comercial provoca desplazamientos de compra desde los centros de menor tamaño hacia los de mayor dotación comercial, provocando evasiones de gasto comercializable o flujos comerciales. Para determinar el efecto de variables de atracción y de restricción en los flujos comerciales de alimentos en las regiones VIII, IX y X de Chile, se estimó el modelo de gravitación tradicional. Los atributos de los centros de compra fueron población, ingreso monetario mensual de los hogares, cantidad de patentes y la superficie comercial de establecimientos de venta de alimentos. Como variable de restricción se utilizó la distancia y el tiempo de desplazamiento. Los consumidores que realizan desplazamientos de compra fuera de la... |
| Tipo: Journal article |
Palavras-chave: Áreas comerciales; Desplazamientos de compra; Gravitación comercial. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000200002 |
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| Rodríguez,Yaritza; Depestre,Tomás; Gómez,Olimpia. |
| Las enfermedades virales constituyen el principal obstáculo para el desarrollo del pimiento (Capsicum annuum) en el mundo. En Cuba, lo afectan principalmente el virus del mosaico del tabaco (TMV), el virus del mosaico del pepino (CMV), el virus Y de la papa (PVY), el virus del grabado del tabaco (TEV) y el virus del moteado de las venas del pimiento (PVMV). Dado que su control se hace cada vez más difícil, los fito-mejoradores han tenido que recurrir al control genético como vía más eficiente para lograr el desarrollo de este cultivo. La necesidad de seleccionar líneas de pimiento multi-resistentes a las principales enfermedades, de frutos grandes y de buena adaptación, cobra mayor importancia cada día, para ser utilizados como progenitores de híbridos F1... |
| Tipo: Journal article |
Palavras-chave: Híbridos; Multi-resistencia; Pimiento. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000300008 |
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| Lara,Nelson; Figueroa,Leonardo; Carvajal,Fabiola; Zapata,Yubinza; Urbina,Camilo; Escobar,Hugo. |
| N. Lara, L. Figueroa, F. Carvajal, Y. Zapata, C. Urbina, and H. Escobar. 2013. Quantitative differentiation between soil organic carbon and biochar carbon in Aridisol. Cien. Inv. Agr. 40(2): 387-395. To understand the effect of biochar, identify its presence and quantify its stability in soil, it is necessary to differentiate between the two main sources of carbon. These sources are resident soil organic matter and biochar, which is produced by burning organic matter under low oxygen concentration in a process known as pyrolysis. The present study employs solid-liquid extraction with an alkaline solution, the efficiency of which was improved by a reflux system and quantification using the modified Walkley-Black method, to distinguish the two carbon sources... |
| Tipo: Journal article |
Palavras-chave: Alkaline extraction; Differentiate; Humic acid; Organic carbon. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200013 |
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| Martínez-Montoya,Juan F; Herrero-Isern,Juan; Aceves-de Alba,Jorge; Palacio-Núñez,Jorge; Ruiz-Vera,Víctor M; Olmos-Oropeza,Genaro. |
| The gypseous soils of San Luis Potosí State, México, are not well map-delimited, despite their broad extent and the specific agricultural and environmental management they require. The present article highlights the location and extent of the gypseous lands in the Altiplano and Zona Media of San Luis Potosí State. For this purpose, soil, geology and vegetation maps as well as studies related to gypsum-rich soils, aerial photographs, and satellite maps (termed 'espaciomapas' in Spanish, these refer to Landsat-5 Thematic Mapper images of Red-Green-Blue:432 composition printed at 1:250,000 scale) were reviewed. Additionally, field and laboratory work were carried out. The maps provided by the Commission for Studies of the National Territory (CETENAL) proved... |
| Tipo: Journal article |
Palavras-chave: Cartography; Landsat images; Sustainable land use; Photo interpretation. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300013 |
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| Mendívil,Manuel Antonio; Muñoz,Pedro; Morales,María Pilar; Juárez Castelló,Manuel C. |
| Each year, viticulture generates thousands of tons of vine shoots in the Spanish La Rioja region without an adequate system for their use. This study attempts to increase the value of this residual biomass, mainly for energy generation. To this end, a representative sampling of vine varieties and vineyards in the region was taken and later thermochemically characterized, measuring moisture, ash content percentage, elemental composition and higher heating value (HHV) among all sampled lots. From these tests, only the variety factor of the vine exhibited any statistically significant influence. A correlation has been formulated to express the higher heating value of vine shoots in terms of their elemental composition, obtaining an estímate with a mean... |
| Tipo: Journal article |
Palavras-chave: Energy potential; Higher heat value; Thermochemical characterization; Vine shoots. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000300012 |
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| García-Ortuño,Teresa; Carbonell-Barrachina,Angel A; Andreu-Rodríguez,Javier; Ferrández-García,María T; Calín-Sanchez,Angel; Ferrández-Villena,Manuel; Ferrández-García,Clara E. |
| Giant reed (Arundo donax L.) is currently one of the greatest invasive threats to Mediterranean-type river ecosystems worldwide and can be easily transformed into a cheap and sustainable material that can be used in the manufacturing of containers for the fruit and vegetable industry. Simple trays were prepared using giant reed, and their behavior was evaluated during storage oftomatoes and strawberries. The mechanical properties of the giant reed particleboards were assayed, and it was shown that they are suitable for industrial purposes. The quality of strawberries and tomatoes stored for 7 and 14 days, respectively, in plywood (control) and giant reed containers was comparable, with no significant differences found. The parameters analyzed included... |
| Tipo: Journal article |
Palavras-chave: Arundo donax; Invasive weed; Mechanical properties; Shelf-life; Storage; Sustainable containers. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100013 |
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| Loza-Murguía,Manuel G; Acho,René; Arce,Alcides; Huaycho,Roxana; Aruhiza,Nicanor; Mamani,Sofía. |
| The macrofauna is an important component of ecosystems because its participation in the biodegradation of soil nutrients has beneficial effects on the food chain. During six months, from February through July, a number of worms and their biomass (g m-2) were assessed in the soil of the Estación Experimental of Kallutaca, located on the plateau of La Paz. A study area of one hectare of fallow land was delimited. The study area had been without tillage activity for approximately ten years. This area was divided into five rings. Each ring had eight sampling points. Each sampling point included a square meter of soil and had a depth of 30-35 cm. The density and biomass of earthworms recorded in this study were 13.6 ± 29.74 m-2 and 4.7315 ± 2.3544 g m-2,... |
| Tipo: Journal article |
Palavras-chave: Earthworms; Seasonal density; Soil; Study area. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300011 |
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| Temel,Suleyman; Pehluvan,Mucahit. |
| Fruit tree and poplar leaves that fall in autumn are undervalued in terms of animal feeding mainly because of insufficient knowledge about their potential feeding value. Knowledge of the nutritional values of these species may be important to supplement the feed of grazing animals. The objective of this study was to evaluate the potential fodder value of leaves of plum, apple, poplar, mulberry, peach and apricot trees. For this purpose, samples were collected by hand in autumn 2012 and 2013 when 50% of the leaves had dropped and 90% of the leaves had turned yellow. The crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), dry matter digestibility (DMD), digestible energy (DE), metabolizable energy (ME)... |
| Tipo: Journal article |
Palavras-chave: Ruminant feeding; Fodder trees; Nutritional value; Supplementary fodder source. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000100003 |
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| Oberpaur,Christel; Puebla,Víctor; Vaccarezza,Flavia; Arévalo,María E. |
| Nursery producers grow plants in containers, mainly using substrates based on peat. In order to replace the use of peat, diverse mixtures of substrates combining different proportions of the moss Sphagnum magellanicum Brid. (40, 50 and 60%) and alternative organic materials, such as compost, humus and composted pine bark, were tested. In the frst trial under laboratory conditions, conducted in October 2006, the physicochemical characteristics of nine initial mixtures, including a control, were determined. Five mixtures, with similar physicochemical conditions as the control, and a commercial peat mixture, were selected by the application of Euclidean minimum distances. The fnally selected mixtures were three combinations of moss with composted pine bark... |
| Tipo: Journal article |
Palavras-chave: Compost; Composted pine bark; Humus; Lactuca sativa; Lettuce; Moss; Sphagnum. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100012 |
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| Pérez,Patricio; Maino,Mario; Morales,María Sol; Tomic,Gerda; Aguilera,Francisco; Egaña,Juan Ignacio. |
| Twenty-eight Merino Precoce suckling lambs raised under confinement in the Mediterranean semi-humid dryland of Central Chile were studied to evaluate meat quality and major carcass characteristics. Animals were grouped by slaughter weight (10 and 15 kg) and sex (7 males and 7 females in each weight group). The average commercial and true dressing percentages were 53 and 55%, the average ribeye area was 11.7 cm², and the average dorsal fat thickness was 1.5 mm. The largest retail yields were those of the leg and shoulder, at 38 and 22%, respectively. The tissue composition of the leg was 58% muscle, 23% bone, 12% fat, 3.6% residues, and 3% shrink loss. The tissue composition of the shoulder was 57% muscle, 23% bone, 11% fat, 3.7% residues and 3.2% shrink... |
| Tipo: Journal article |
Palavras-chave: Chile; Meat quality; Suckling lambs. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200005 |
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| Balseca,Diana G; Cienfuegos,Eugenia G; López,Hilda B; Guevara,Hernán P; Martínez,Juan C. |
| This research evaluated the nutritional value of five varieties of Brachiarias: B. decumbens Stapf; B. brizantha Marandú; B. brizantha Piatá; B. brizantha Xaraés; and Mulato II [B. ruziziensis × B. brizantha]). The Brachiarias were combined at different inclusion rates (0, 10 and 15%) with two tropical forage legume species (Centrosema pubescens and Cajanus cajan, ECV22). The samples were collected at the experimental farm, The Oasis, a property of the Universidad Tecnológica Equinoccial (Ecuador), with 42 d of regrowth for the Brachiarias and 150 d for the legumes in the dry season. The proximate analysis and the Van Soest procedure were performed in the laboratory of food science and animal nutrition of the Escuela Superior Politécnica de Chimborazo... |
| Tipo: Journal article |
Palavras-chave: Brachiaria; Cajanus cajan; Centrosema pubescens; Digestibility; Grasses; Legumes; Nutritional value. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000100006 |
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| Tapia,Maria Luisa; Caro,José Marcelo. |
| The quality of lettuce (Lactuca sativa) seedlings is closely dependent on the substrate and the management practice during the transplant to the hydroponic system. This seed bed process may affect the normal development of the seedlings by affecting the post-transplanting period, potentially causing root stress, influencing establishment and even leading to seedling loss. An important criterion when choosing either a single or mixed substrate is the ability to provide for both growth and establishment of the seedlings in the hydroponic system. The main objective of this study was to evalúate the effect of granulated rockwool substrate (Agrolan, Compañía IndustrialEl Volcán S.A., Santiago, Chile), expanded perlite A6 (Harbolite Chile Ltda., Santiago,... |
| Tipo: Journal article |
Palavras-chave: Hydroponic; Lactuca sativa; NFT-modified hydroponic; Seedling bed; Substrate; Transplant stress. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300007 |
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| Bazzigalupi,Omar; Pistorale,Susana M; Andrés,Adriana N. |
| La variabilidad fenotípica de diez poblaciones naturalizadas de agropiro alargado (Thinopyrum ponticum), fue evaluada en un programa de selección cuya finalidad es proveer cultivares adaptadas a suelos salinos, que en Argentina representan el 8% de la superficie agropecuaria total. Las poblaciones se colectaron en la pampa deprimida, Buenos Aires, Argentina El objetivo fue evaluar su germinación en estrés salino por soluciones de NaCl 0, 60, 135 y 220 mM equivalentes a conducitividad eléctrica de 0, 6, 12 y 18 dSm-1. Las semillas fueron sembradas sobre toallas de papel e incubadas en cámara de germinación con alternancia diaria de temperatura (20-30°C) y luz (16-8 h). Se empleó un diseño en bloques completos aleatorizados con arreglo factorial, con cuatro... |
| Tipo: Journal article |
Palavras-chave: Agropiro alargado; Estrés osmótico; Germinación; Salinidad; Thinopyrum ponticum; Variabilidad. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000300005 |
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| Sazo,Luis; Araya,Jaime E; de la Cerda,José. |
| Se estudió durante la temporada 2005-2006 el efecto del coadyuvante siliconado trisiloxano en combinación con poliéter (Break) en concentraciones de 50, 75 y 100 mLhL' junto con insecticidas en el control de chanchito blanco de la vid (Pseudococcus viburni) en dos viñedos comerciales de la Región Metropolitana de Chile, infestados naturalmente la temporada precedente, como parte de un programa normal de control, con clorpirifos en post-cosecha y previo al cierre del racimo (verano), y diazinon en brote de 10-15 cm en primavera. Se incluyó un tratamiento estándar de diazinon sin surfactante y un testigo sin aplicación. En cosecha, se determinaron los racimos sanos y con diversos grados de infestación, sobre 100 racimos por unidad experimental. Los... |
| Tipo: Journal article |
Palavras-chave: Break; Chanchito blanco de la vid; Chlorpirifos; Coadyuvante; Diazinon surfactante; Vitis vinifera. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200012 |
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| Parodi,Patricio C; Gaju,María de los Angeles. |
| The objective of this experiment was to evalúate the male sterilizing activity induced by the chemical hybridizing agent (CHA) clofencet, on four wheat varieties: two Triticum aestivum cultivars, 'Pia' and 'Claudia', and two Triticum turgidum var. durum cultivars, 'Capri' and Ambra'. The CHA was sprayed at two stages of the Feekes scale, 7.5 and 8.5, using four rates of active ingredients (0, 3.5, 5.0 and 6.5 kg-ha4) in a split block design with five replicates. The efficiency of the treatments was determined by measuring developed seeds and calculating male sterility (MS). Results showed that MS increased with increasing dosage and was more pronounced at the latest stage of development. The MS average for the highest dosage was 47.3% in the first stage of... |
| Tipo: Journal article |
Palavras-chave: Triticum aestivum; Triticum turgidum; Hybrid seed; Male sterelizing; Chemical hybridizing. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000200011 |
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| Registros recuperados: 7.826 | |
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