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| Registros recuperados: 7.826 | |
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| Pino,Cesar; Silva,Gonzalo; Hepp,Ruperto; Venegas,Fernando. |
| El chape del cerezo es una de las plagas más importantes del cerezo debido a que el ataque se produce durante la cosecha y su control se basa solamente en insecticidas sintéticos. El objetivo de este trabajo fue evaluar un ácido graso de baja toxicidad para mamíferos. En laboratorio, en placas Petri con diez larvas, se estimó mortalidad y concentración letal 50% (CL50) de Peak Plus® sobre Caliroa cerasih. Se evaluaron cinco concentraciones de Peak Plus® más un testigo absoluto, con cuatro repeticiones y un diseño experimental completamente al azar. Se evaluaron seis tratamientos, incluyendo un testigo absoluto, con cinco repeticiones en un diseño experimental de bloques completamente al azar. En laboratorio, los valores de CL50 y CL90 a las 24 h fueron de... |
| Tipo: Journal article |
Palavras-chave: Acido graso; Cerezo; Chape del cerezo; Defoliación; Plagas. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000100003 |
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| Huerta,Amanda; Faúndez,Miguel; Araya,Jaime E. |
| To determine the susceptibility of important species of eucalypt trees in Chile to Glycaspis brimblecombei Moore (Hemiptera: Psyllidae), an insect that was detected on Eucafyptus camaldulensis Dehn. in 2002 in Santiago, which causes defoliation of trees affected, and even their death in severe infestations, a field evaluation of an induced infestation was performed in 2004 of one-year-old plants of E. camaldulensis, E. nitens Deane & Maiden, and E. globulus Labill Growths of infested plants were compared with uninfested controls, using destructive sampling at 15, 30, 45, and 60 days. Also, observations were made regarding the duration of the development stages of the insect during two generations. The only species that was susceptible to the... |
| Tipo: Journal article |
Palavras-chave: Eucalyptus camaldulensis; Eucalyptus globulus; Eucalyptus nitens; Glycaspis brimblecombei; Red gum lerp psyllid. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200003 |
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| Goulart,Eduardo da S; Braga Schuch,Luis O; Tunes,Lilian V. Madruga de; Vieira,Jucilayne F. |
| The practices and techniques used in irrigated rice to improve performance include optimal plant density and the best arrangement of the plants in an area. This study aims to evaluate the performance and plasticity in the yield and grain quality of three rice hybrids using different row spacing. The field experiments were conducted during the 2010/2011 season in rice crops in Capão do Leão, Viamão and Uruguaiana in the state of Rio Grande do Sul, Brazil. Three different sowing arrangements were evaluated, i.e., row spacing of 17 cm, 34 cm, and 17 cm alternated with 34 cm, which corresponded to densities of 40, 20 and 32 kg ha-1, respectively. The experimental design used was randomized blocks with subdivided plots replicated three times considering each... |
| Tipo: Journal article |
Palavras-chave: Irrigated rice; Oryza sativa L; Plant densities; Row spacing. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000100008 |
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| Saldaña y Hernández,María I; Gómez-Álvarez,Regino; Rivera-Cruz,María del C; Álvarez-Solís,José D; Pat-Fernández,Juan M; Ortiz-García,Carlos F. |
| M.I. Saldaña y Hernández, R. Gómez-Álvarez, M. del C. Rivera-Cruz, J.D. Álvarez-Solís, J.M. Pat-Fernández, and C.F. Ortiz-García. 2014. The influence of organic fertilizers on the chemical properties of soil and the production of Alpinia purpurata. Cien. Inv. Agr. 41(2): 215-224. Organic fertilizers are an important contribution of organic matter that modify the physical, chemical and microbiological characteristics of the soil. To determine the impact of solid and liquid fertilizers on Alpinia purpurata, the nutritional characteristics of the soil and the responses of the plants were evaluated at 40 and 365 days in Medellín and Madero and Ignacio Allende, Tabasco, Mexico. The treatments were compost, vermicompost, fermented manure, Bokashi, liquid humus... |
| Tipo: Journal article |
Palavras-chave: Bokashi; Compost; Fermented manure; Macronutrients; Red ginger; Vermicompost. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000200008 |
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| Espindula,Marcelo C; Campanharo,Marcela; Dias,Jairo R. M; Rocha,Valterley S; Souza,Moacil A. de; Menoncin,Giovana. |
| The use of urease inhibitors and irrigation are management options to increasing the efficiency of top-dressed urea by reducing NH3 volatilization. The purpose of this study was to evaluate the productive performance and N recovery of 'BRS 254' wheat plants without irrigation after applying urea or urea+NBPT [N-(n-butyl)thiophosphoric triamide] as the top dressing. The experiment was carried out in Viçosa, MG, Brazil, between May and September of 2008 using a complete randomized block design with a 2×6+1 factorial arrangement of the following treatments: 1) urea or urea+NBPT, 2) six periods without irrigation (0, 48, 96, 144, 192 or 240 h after applying the top-dressing fertilizer), and 3) a control without N; there were four replications. The data were... |
| Tipo: Journal article |
Palavras-chave: Triticum aestivum; Nitrogen fertilization; Nitrogen recovery; Volatilization of NH3. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000200014 |
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| Farias dos Santos,Joana; Roppa,Cristiane; Holanda de Oliveira,Schweyka Stanley; Valcarcel,Ricardo. |
| The study was taken in a reclamation area where soil was removed up to 13 meters deep in 1979, near Itaguaí county, Brazil (23º 55' 07'' S, 43º 49' 73'' O). In 2007 the composition and horizontal structure of the shrubby-arboreal strata was evaluated in five 13 years old forest plantations with similar environment conditions. For rehabilitation, rustic pioneer species were used to guarantee a sustainable successional process, which depends on species selection and their functional complementarities. Treatments were: T0 (control); T1 (100 % of exotic species); T2 (52% of exotic species); T3 (50% exotic and 50% native); T4 (39% exotic and 61% native); and T5 (15% exotic and 85% native). Variables measured were height, DBH (≥ 3.0 cm), basal area,... |
| Tipo: Journal article |
Palavras-chave: Degradation area; Mining; Tree species; Vegetal succession. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100009 |
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| ur-Rehman,Saif; Farooq Khan,Zia; Maqbool,Tahir. |
| Honey is a naturally sweet and viscous fluid produced by honeybees {Apis mellifera) from the néctar of flowers that, by definition, does not include any other substances. The objectives of this work were to characterize Pakistani honey, physically and chemically in relation to international standards, and to study the effects of adulteration with sugar syrup on the physical properties of honey. For this purpose, 200 honey samples obtained from 15 different locations in Pakistán, ranging from desert to hilly áreas, were collected in 2005-2006. Samples were prepared by the acid digestión method. Physical properties, conductance, surface tensión, and pH were determined using digital instruments. The most abundant minerals found in Pakistani honey samples were... |
| Tipo: Journal article |
Palavras-chave: Acid digestión; AAS; Honey adulteration; Honey; Major and minor elements; Physical properties. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200009 |
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| Baldini,Aída; Oltremari,Juan; Holmgren,Astrid. |
| Cinara cupressi es un áfido introducido que puede producir la muerte de árboles forestales, debido a un compuesto tóxico que inyecta durante su alimentación. En Chile se encuentra ampliamente distribuido infestando diversas especies de Austrocedrus, Cupressus, Chamaecyparis, Juniperus, Thuja y al híbrido Cupressocyparis. Austrocedrus chilensis se ve afectado en toda su distribución. Dado que este insecto en África infestó árboles de los géneros Callitris y Widdringtonia, emparentados filogenéticamente con Fitzroya, Austrocedrus y Pilgerodendron, esta plaga podría también adaptarse a plantas nativas como alerce (Fitzroya cupressoides) y ciprés de las Guaitecas (Pilgerodendron uviferum). Ambas especies se encuentran amenazadas. El presente estudio intenta... |
| Tipo: Journal article |
Palavras-chave: Cinara cupressi; Austrocedrus chilensis; Control químico; Plagas forestales. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000300012 |
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| Donoso,Pablo J; Soto,Daniel P; Schlatter,Juan E; Büchner,Carlos A. |
| Native Nothofagus dombeyi growth rates excel in secondary forests and in some plantations, and the species has good timber quality. However, few have reported on the effects of fertilization on N. dombeyi plantations. This is a key matter since fertilization has environmental and financial costs, and therefore its use to increase growth and survival for production or restoration must be carefully evaluated. Here we evaluated the early effects of fertilization (control and three levels) using several performance variables (leaf properties, growth, plant quality, and survival) in a N. dombeyi plantation at a low elevation in the Coastal Range of south-central Chile, which has a rainy temperate climate and medium fertility soils. Four years after plantation... |
| Tipo: Journal article |
Palavras-chave: Fast-growing tree species; Hardwood plantations; Mineral nutrition; Plant quality; Survival. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300014 |
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| Torres,Fabiola; Rodríguez,Marcela A; Lavandero,Blas; Fuentes-Contreras,Eduardo. |
| Codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), is the key pest of apple and walnut production worldwide. Among other variables, successful management of this pest is dependent on adult dispersal at the local scale. Body mass and wing geometric morphology were evaluated on female and male codling moth adults collected from apple and walnut trees in three localities of the Region of Maule. Codling moth adults were obtained by rearing diapausing larvae collected from the field. Newly emerged adults were killed, and the total dry weight, thorax weight and abdomen weight were calculated. The wings were cleared and mounted for morphometric analyses: 15 and 11 characteristics of the fore and hind wings, respectively, were measured, including the... |
| Tipo: Journal article |
Palavras-chave: Apple; Aspect ratio; Cydia pomonella; Landmark-analysis; MorphoJ; Walnut; Wing loading. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000300008 |
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| Castillo,Miguel E; Rodriguez y Silva,Francisco. |
| A study of response times for the arrival of terrestrial forest fire fighting resources was undertaken. The advantage of the method proposed here is that it may be exactly replicated in different countries and under different environmental conditions, budgets and infrastructures for wildfire combat. This is an international-level support offering better reference material for optimizing terrestrial resources. In the combat of forest fires, fire fighting resource response times are of particular importance when evaluating fire advance speed and fire damage potential against time. Due to the importance of speed in fire containment and the economic consequences of a fire, a fire combat response time curve was constructed using fire fighting operation data... |
| Tipo: Journal article |
Palavras-chave: Extinction times; Forest fire; Fire combat; Fire behavior. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000100010 |
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| Salazar-González,Claudia; Vergara-Balderas,Fidel T; Ortega-Regules,Ana E; Guerrero-Beltrán,José Á. |
| Liquid extracts of dried Roselle (Hibiscus sabdariffa) calyces obtained using ethanol:water (50:50 and 70:30%, v/v), water, ethanol:1.5 N HCl (85:25%, v/v), and ethanol (96%) to evaluate selected antioxidant characteristics (phenolic compounds and antioxidant capacity), color parameters (L, a, and b), and anthocyanins (delphinidin-3-O-sambubioside, delphinidin-3-O-glucoside (myrtillin), and cyanidin-3-O-sambubioside) by high performance liquid chromatography (HPLC). The total monomeric anthocyanin content was also assessed using the differential pH technique. The phenolic compound content ranged from 1,067±22 (in ethanol) to 2,649±96 (in ethanol:water 70:30%) mg of gallic acid100 g-1 of dehydrated calyces, and the antioxidant capacity ranged from 3.11±0.50... |
| Tipo: Journal article |
Palavras-chave: Anthocyanins; Antioxidant capacity; Cyanidin-3-O-sambubioside; Delphinidin-3-O-sambubioside; Delphinidin-3-O-glucoside; Myrtillin; Hibiscus sabdariffa; Roselle calyces. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100006 |
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| Mendoza Cortez,Juan W; Cecílio Filho,Arthur B; Coutinho,Edson L; Alves,Anarlete. |
| This work was carried out in Jaboticabal (575 m altitude, 21°15΄ 22˝ S and 48° 15΄ 58˝ W), São Paulo, Brazil, aiming to investigate the effects of cattle manure and nitrogen (urea) doses on radish height and yield. Randomized blocks were used with a 2x4x4 factorial scheme and 3 replications. The treatments were combinations of cultivars (25 and 19), cattle manure doses (0, 25, 50, and 75 t ha-1 dry basis) and N doses (0, 60, 120 and 180 kg ha-1). Increased cattle manure and urea doses provided higher plant height and commercial yield in both cultivars, but the N produced more signifcant effects than the cattle manure. The maximum commercial yield of cultivar (cv) 19 (20.34 t ha-1) was obtained using 75 t ha-1 of cattle... |
| Tipo: Journal article |
Palavras-chave: Raphanus sativus; Fertilization; Yield. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100004 |
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| Sotomayor,Carlos; Norambuena,Paulina; Ruiz,Rafael. |
| The effect of foliar boron treatments on fruit growth and seed development in Actinidia deliciosa, cv. Hayward, was studied. The distal leaves (BH) or fowers (BF) of a shoot were sprayed with 500 mg L-1 boric acid during the fowering period. The mobility of boron from the leaves to the fowers through the phloem was determined by spraying only the leaves. From 0 to 96 h after treatment, leaves and fowers were sampled and total boron was assessed. At harvest time, fruit weight and diameter plus seed weight and number were measured for the different treatments. The weight of fruits growing from shoots with boron-treated leaves were 14.1% higher than the control, while the weight of fruits derived from boron-treated fowers was 17% higher than that of fruits... |
| Tipo: Journal article |
Palavras-chave: Boric acid; Boron; Fruit weight; Kiwifruit; Seed number; Seed weight. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000100013 |
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| Jarquín-Sánchez,Aarón; Salgado-García,Sergio; Palma-López,David J; Camacho-Chiu,Wilder. |
| The objective of this study was to predict the concentration of soil organic matter (SOM) in tropical soils using near-infrared spectroscopy (NIRS) for samples measured within a polyethylene bag and without a bag. One hundred and fifty six soil samples from the humid tropics of Tabasco, Mexico with contrasting chemical characteristics were selected. The samples were dried, ground, and sieved through 2 mm and 5 mm screens, and their SOM contents were determined using the Walkley-Black method. The soil samples were packed in polyethylene bags, and SOM was measured directly with and without a bag using a quartz probe (FOSS 5000 model of NIRsystems, DK-3400 Hillerod,Denmark) for a range from 1100 to 2000 nm to obtain a prediction model of SOM. The model for... |
| Tipo: Journal article |
Palavras-chave: Chemical analysis; Tropical soil; Optical fiber; Model; Organic matter prediction. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200015 |
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| Baridón,Esteban; Flores Palenzona,Mario; Marlats,Raúl; Senisterra,Gabriela; Millán,Guillermo. |
| El objetivo del presente trabajo fue evaluar el crecimiento de clones de Populus spp. en suelos de tipo Hapludoles y Argiudoles de la zona continental de la Provincia de Buenos Aires. El estudio se localizó en Alberti (34°50' S, 60°30' O, 35 m.s.n.m.), Buenos Aires, Argentina y se utilizó Populus deltoides ('Stoneville 66' ('Delta Gold'), 'A-610-31' y 'A-564-17') y P. x canadensis ('I-Conti 12' y 'A-568-1'). El diseño experimental fue de bloques completos al azar con submuestreo. Se instalaron tres bloques, sobre tres tipos de suelo: Hapludol típico, Hapludol éntico y Argiudol típico. Se realizó una caracterización físico-química de cada suelo, se registraron los valores medios de área basal y altura total de los árboles. Los resultados se sometieron a... |
| Tipo: Journal article |
Palavras-chave: Argentina Argiudoles crecimiento Hapludoles Populus spp.; Salicaceae. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000300006 |
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| Registros recuperados: 7.826 | |
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