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| Registros recuperados: 66 | |
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| Mancilla Villa, Oscar Raúl. |
| Los objetivos de esta investigación fueron realizar el diseño, trazo y construcción de terrazas de banco para plantaciones forestales comerciales en el Rancho Jesús María, Valle de Bravo, México, evaluar su eficiencia técnica y determinar su factibilidad financiera. El diseño consistió en determinar los intervalos vertical y horizontal de los bancales, con base en la precipitación, pendientes dominantes en el terreno (15% y 30%), la textura del suelo y los requerimientos del silvicultor; se diseñaron 70 terrazas con 3 m de ancho por 0.45 m y 0.90 m de alto para las pendientes respectivas, en un total de 4 ha de terreno y se plantaron 3,757 árboles comerciales. Para la eficiencia técnica se midieron la infiltración, el escurrimiento superficial y la... |
| Tipo: Tesis |
Palavras-chave: Terrazas de banco; Pérdida de suelo; Escurrimiento superficial; Infiltración; Eficiencia técnica; Viabilidad financiera; Maestría; HIdrociencias; Bench terraces soil loss; Superficial glide; Infiltration; Technical efficiency; Financial viability. |
| Ano: 2008 |
URL: http://hdl.handle.net/10521/1422 |
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| Feitosa,Carlos E. L.; Costa,Pedro H. dos S.; Meneses,Kamila C. de; Oliveira,Ulisses C. de; Farias,Maryzélia F. de. |
| ABSTRACT Soil compaction in agricultural areas has greatly increased in recent decades due to intensive farming practices, including short-cycle crops and machinery intensification. This study aimed to evaluate the impacts of management systems on the physical quality of a dystrophic Yellow Oxisol, in the Cerrado region of Brazil. Treatments consisted of five soil management systems, with five replications (native forest [control], slash-and-burn agriculture, pasture, no-tillage, and conventional tillage). Data analysis was performed using a completely randomized experimental design. All systems were analyzed for soil density, macroporosity, microporosity, total porosity, hydraulic conductivity, infiltration, water retention curve, penetration resistance,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: S index; Land cover change; Physical properties; Infiltration; Soil compaction. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000500609 |
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| Oyarzún,Carlos; Godoy,Roberto; Staelens,Jeroen; Aracena,Claudia; Proschle,Juan. |
| Forest structure and tree species can have a significant impact on total atmospheric nitrogen (N) deposition; for example, deciduous forests have higher N requirements than coniferous forests. However, knowledge about the effect of the conversion of native Chilean vegetation cover by exotic plantations on N cycling is scarce. The aim of this study was to determine the effect of the replacement of a Nothofagus obliqua native forest by a Pinus radiata plantation in southern Chile on the chemistry of throughfall, stemflow, soil water infiltration and percolation. Pinus radiata stemflow was more acidic (pH 4.7) than precipitation (pH 5.2) and throughfall (pH 5.6), while in the Nothofagus forest stemflow and throughfall pH were 6.3 and 6.1, respectively. In the... |
| Tipo: Journal article |
Palavras-chave: Ammonium; Infiltration; Nitrate; Soil percolation; Throughfall. |
| Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200004 |
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| King, B.A.. |
| Numerous moving spray-plate center-pivot sprinklers are commercially available providing a range of drop size distributions and wetted diameters. A means to quantitatively compare sprinkler choices in regards to maximizing infiltration and minimizing runoff is currently lacking. The objective of this study was to develop a soil independent quantitative runoff potential index to facilitate selection of sprinklers for center-pivot sprinkler irrigation systems. Drop sizes, velocities and water application rates of numerous moving spray-plate sprinklers were measured in the laboratory over a range of flow rates and operating pressures. The proposed sprinkler runoff index is based on application rates of kinetic energy and water computed by overlapping specific... |
| Tipo: Article |
Palavras-chave: Sprinkler irrigation; Infiltration; Center pivot. |
| Ano: 2016 |
URL: http://eprints.nwisrl.ars.usda.gov/1612/1/1569.pdf |
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| King, B.A.; Bjorneberg, D.L.. |
| The marked reduction in infiltration rate caused by formation of a soil surface seal due to water droplet impact on bare soil is a well known phenomenon but is rarely considered in infiltration models, especially under center pivot irrigation. The objective of this study was to develop a soil infiltration model for center pivot sprinkler irrigation that incorporates the transient reduction in soil surface seal hydraulic conductivity as affected by soil and sprinkler characteristics. A sealing soil infiltration model was developed using an explicit finite difference solution scheme with a transient soil seal formation model, which is unique from other studies in that it explicitly uses droplet specific power as the driving factor for formation of a soil... |
| Tipo: Article |
Palavras-chave: Sprinkler irrigation; Infiltration; Center pivot. |
| Ano: 2012 |
URL: http://eprints.nwisrl.ars.usda.gov/1469/1/1434.pdf |
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| Registros recuperados: 66 | |
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