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| Registros recuperados: 17 | |
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| Borie,Fernando; Rubio,Rosa; Morales,Alfredo; Curaqueo,Gustavo; Cornejo,Pablo. |
| Arbuscular mycorrhizal (AM) association plays a key role in the sustainability of terrestrial plant ecosystems, in particular those presenting limitations for the establishment and subsequent growth of plants. In Chile, more than 50% of arable soils are originated from volcanic ashes, showing in general several constraints to crop production, such as low pH, high exchangeable aluminum content and low levels of available P. Under these conditions, the management of AM fungal propagules using adequate cultural management practices emerges as a successful alternative in order to maximize the positive effects of AM symbiosis on plant growth in these types of soil. This review presents the results of several years of research about the effect of different... |
| Tipo: Journal article |
Palavras-chave: Andisol; Management practices; Mycorrhizal propagules; N sources; P fractions; Ultisol. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100001 |
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| Tortella,G.R; Rubilar,O; Cea,M; Wulff,C; Martínez,O; Diez,M.C. |
| Degradation of the insecticide chlorpynfos (160 a.i mg kg-1) using a biomix of a biobed system biostimulated with inorganic fertilizer (NPK) was investigated. Three concentrations of the fertilizer (0.1%, 0.5% and 1.0% ww-1) were evaluated on chlorpynfos degradation, TCP (3, 5, 6-trichloro-2-pyrinidol) accumulation and biological activity of the biomix. The chlorpynfos was dissipated efficiently (>75%) after 40 days of incubation and no additional dissipation was obtained with increasing concentration of NPK after 20 days of incubation. TCP accumulation occuned in all evaluated NPK concentrations and its concentration increased with the increment of NPK addition raising the probability of leaching of this compound. Biological activity (FDA and... |
| Tipo: Journal article |
Palavras-chave: Chlorpyrifos; Bio stimulation; NPK fertilizer; Biobed; Andisol. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000200007 |
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| Gómez-Rodríguez,Katherine; Camacho-Tamayo,Jesús H.; Vélez-Sánchez,Javier E.. |
| Frequent traffic of tractors in agricultural soils, promotes soil compaction and affects the flow and water availability. The aim of this research was to study the effect of compaction induced by tractor traffic on water availability in the soil under different traffic intensities on the same path (0, 1, 3, 6 and 10 passages), to two tractors with 3.3 and 2.6 ton of weights, over three different surface conditions. The study was conducted in an Andisol, representative soil of the study area. It was determined the behavior of the water retention curve, obtaining the gravitational water, available water and hygroscopic water, to 10 and 30 cm of depth. The hygroscopic water is the most prevalent with values of up to 80% of the total water present in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Compaction; Soil management; Water retention curve; Andisol. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600008 |
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| Hirzel,Juan; Undurraga,Pablo; González,Jorge. |
| Long-term crop rotation systems can benefit soil chemical-physical properties and crop productivity. The lack of information on the effect of long-term crop rotations on soil chemical-physical properties for volcanic soils in Chile could restrict reaping real benefits, and make it difficult to take agricultural management decisions, which could lead to possible negative consequences on some soil chemical-physical properties and the environment. The development of information associated with the effect on soil chemical-physical properties with respect to long-term rotation systems and their fertilization management contribute to improving agronomic management decisions for these soils. A study was carried out to assess the effect of six rotation systems... |
| Tipo: Journal article |
Palavras-chave: Crop rotation; Andisol; Nutrient management; Soil fertility. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200016 |
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| Castillo,Claudia; Astroza,Ivonne; Borie,Fernando; Rubio,Rosa. |
| Estudios recientes en campo han demostrado que las esporas fúngicas disminuyen cuando se utilizan como pre-cultivo no hospederos. El objetivo de este trabajo fue estudiar la influencia de un cultivo hospedero, avena (Avena sativa L.) y cultivos no hospederos, como lupino (Lupinus albus L.) y raps (Brassica napus L.) sobre los propágulos de hongos micorrícicos arbusculares (HMA) y diversidad fúngica junto con la actividad fosfatásica en un Andisol serie Temuco e Inceptisol serie Lumaco. El ensayo se realizó en condiciones de invernadero, desde septiembre de 2006 hasta marzo de 2007, utilizándose macetas de 5 kg con un diseño experimental completamente al azar con cuatro repeticiones. El número de esporas HMA fue mayor en el Andisol que en el Inceptisol y... |
| Tipo: Journal article |
Palavras-chave: Avena; Lupino; Raps; Andisol; Inceptiso. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000100004 |
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| Dörner,José; Dec,Dorota; Peng,Xinhua; Horn,Rainer. |
| Los suelos volcánicos del sur de Chile constituyen cerca del 60% del suelo arable del país. Estos suelos se encuentran bajo un amplio rango de usos desde sistemas prístinos hasta otros con un uso intensivo. El objetivo de este trabajo fue determinar el efecto del cambio de uso de suelo sobre: i) la estabilidad del suelo frente a presiones externas e internas; ii) la conductividad hidráulica y iii) su resiliencia funcional. Muestras disturbadas y no disturbadas de suelo fueron recolectadas a 5, 20, 40 cm de profundidad en un suelo Andisol (Typic Hapludand) bajo un renoval de bosque nativo (NF), una pradera de 50 años (P50) y otra de 1 año de uso (Pl). Se determinó la curva de retención de agua, contracción y consolidación, la conductividad hidráulica... |
| Tipo: Journal article |
Palavras-chave: Andisol; Propiedades estructurales; Función de los poros. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912009000300003 |
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| Diez J,M. Cristina; Gallardo A,Felipe; Saavedra,Gisselle; Cea L,Mara; Gianfreda,Liliana; Alvear Z,Marisol. |
| The activities of laccase, Mn-peroxidase, phosphatase and dehydrogenase were studied in a Chilean Andisol (Temuco Serie) contaminated with pentachlorophenol (PCP). Experiments were conducted on the top of 0-20 cm soil, adding different concentrations of PCP (0.41, 4.1 and 41 mg kg-1). Enzymatic activities and residual concentrations of PCP were evaluated in soil incubated at 25 ± 1 ºC for 112 days. Enzyme activities of PCP-treated soil varied according to the PCP concentration added. For instance, an inhibitory effect on Mn-peroxidase activity was not observed during incubation at the three levels of PCP, whereas acid phosphatase activity was only affected by the 0.41 mg kg-1 PCP treatment. By contrast, laccase and dehydrogenase activities were negatively... |
| Tipo: Journal article |
Palavras-chave: Pentachlorophenol; Andisol; Laccase; Mn-peroxidase; Phosphatase; Dehydrogenase. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000300004 |
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| Nissen M,Juan; Quiroz S,Cristian; Seguel S,Oscar; Mac Donald H,Roberto; Ellies Sch,Achim. |
| El objetivo principal de esta investigación fue determinar la conductividad hidráulica en fase no saturada en tres Andisoles bajo dos manejos bosque y praderas en s series Bramadero, Pemehue y Osorno, localizados en la VIIª, IXª y Xª Regiones de Chile, respectivamente. En muestras de suelo no alteradas se determinó la conductividad hidráulica en fase no saturada a distintas profundidades, mediante la metodología propuesta por Becher (1970), que combina la medición del potencial mátrico en el suelo y la aplicación de las ecuaciones de continuidad y de Darcy. Mediante mediciones de potencial mátrico, se monitoreó durante 95 días en laboratorio el proceso de secado en perfiles de suelo no alterados y en ausencia de un nivel freático artificial. Paralelamente,... |
| Tipo: Journal article |
Palavras-chave: Conductividad hidráulica no saturada; Movimiento de agua; Andisol. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912006000100003 |
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| STAELENS,JEROEN; AMELOOT,NELE; ALMONACID,LEONARDO; PADILLA,EVELYN; BOECKX,PASCAL; HUYGENS,DRIES; VERHEYEN,KRIS; OYARZÚN,CARLOS; GODOY,ROBERTO. |
| South Chilean forest ecosystems represent one of the largest areas of old-growth temperate rainforests remaining in the Southern hemisphere and have a high ecological value, but suffer from deforestation, invasion by exotic species, fragmentation, and increasing atmospheric nitrogen (N) deposition. To support sustainable forest management, more knowledge is required on nutrient cycling of these ecosystems. Therefore, a descriptive study of nutrient dynamics was done in four Valdivian rainforests in the lower Andes range of south Chile: old-growth and altered evergreen stands and unmanaged and managed secondary deciduous stands. Time series were measured for (i) mass (four year) and nutrient content (N, K, Ca, and Mg; one year) of litterfall, (ii)... |
| Tipo: Journal article |
Palavras-chave: Andisol; Chile; Nitrogen cycling; Nutrient dynamics; Temperate rainforest. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100010 |
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| Alfaro,Marta; Salazar,Francisco; Iraira,Sergio; Teuber,Nolberto; Villarroel,Dagoberto; Ramírez,Luis. |
| In Chile there is little information on nutrient losses in livestock systems. The experiment was carried out between 2004 and 2006. Two stocking rates (3.5 and 5.0 steers ha-1) were tested under rotational grazing with Black and White Friesian steers on a permanent pasture (67.5 kg N and 40 kg P ha-1 yr-1). To quantify surface runoff losses (N, P, K), three surface lysimeters (5 x 5 m) per treatment were established. N and K leaching losses were estimated with ceramic cups. Runoff and leachate samples were individually analyzed for available and total N, reactive (RP) and total P, and K. Dissolved organic N (DON) and organic P (OP) were estimated as the difference between total and available forms. The stocking rate did not increase total N, P and K losses... |
| Tipo: Journal article |
Palavras-chave: Eutrofication; Water quality; Grazing; Andisol; Beef production. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000200004 |
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| Ribera,Alejandra E; Mora,Maria de la Luz; Ghiselini,Vanessa; Demanet,Rolando; Gallardo,Felipe. |
| We studied the phosphorous (P) and molybdenum (Mo) relationship in soil and red clover (Trifoliumpratense L.) in a non limed and limed acid Andisol of Southern Chile. In soil, we evaluated the effect of different liming (0 and 2000 mg kg-1), P (0, 200 and 400 mg kg-1), and Mo (0, 0.58 and 0.96 mg kg-1) doses supply on soil available Mo. In addition, the availability of P and Calcium (Ca) in treated soils was determinated. In red clover, we studied the Mo and P shoot concentrations and dry matter yield in response to the different treatments applied to the soil. Also, we measured the changes produced by Mo uptake in shoot Cu concentrations. The results showed that both, lime and more strongly P and Mo additions significantly (P ≥ 0.05) increased... |
| Tipo: Journal article |
Palavras-chave: Phosphorous; Molybdenum; Andisol; Red clover. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000100008 |
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| 八木, 哲生; 谷, 昌幸; Yagi, Tetsuo; Tani, Masayuki. |
| 農耕地土壌への有機物施用は,化学的効果として陽イオン交換容量(CEC)の増加などが考えられているが,詳細な荷電特性に関するデータは見られない.また,慣行法であるショーレンベルが一法によるCEC測定は,変異荷電成分を多量に含む土壌においては適切でないと考えられる.本研究では,25年間にわたって堆肥や作物残渣などの有機物を連用した黒ボク土のCECおよび陰イオン交換容量(AEC)を繰り返し平衡法により測定し,荷電特性に対する有機物の連用効果について明らかにすることを目的とした.CECは,有機物施用区が化学肥料区よりも若干高かった.その差はきわめて多量の堆肥(30 Mg ha^<-1>)を毎年連用した区において,pH5.5前後で約20%,pH6.5前後で約10%であった.現実的な堆肥の施用量(15Mg ha^<-1>... |
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Palavras-chave: 活性アルミニウム・鉄; 荷電特性; 黒ボク土; 長期有機物運用; 陽イオン交換容量(CEC); Active aluminum and iron; Andisol; Cation-exchange capacity (CEC); Charge characteristic; Long-term organic matter application. |
| Ano: 2003 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2966 |
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| Registros recuperados: 17 | |
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