| Journal: | Acta agronómica |
| Database: | PERIÓDICA |
| System number: | 000431582 |
| ISSN: | 0120-2812 |
| Authors: | Montoya Salazar, Juan Carlos1 Menjivar Flores, Juan Carlos2 Bravo Realpe, Isabel del Socorro3 |
| Institutions: | 1Universidad del Pacífico, Lima. Perú 2Universidad Nacional de Colombia, Palmira, Valle del Cauca. Colombia 3Universidad del Cauca, Popayán, Cauca. Colombia |
| Year: | 2013 |
| Season: | Abr-Jun |
| Volumen: | 62 |
| Number: | 4 |
| Pages: | 333-343 |
| Country: | Colombia |
| Language: | Español |
| Document type: | Artículo |
| Approach: | Experimental, analítico |
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| Spanish abstract | Los rendimientos en extracción de las sustancias húmicas variaron con el uso del suelo, con predominio de huminas sobre sustancias húmicas extraíbles. Las relaciones E4/E6 mostraron diferencias por uso y tipo de suelo para ácidos húmicos y fúlvicos. Los índices de hidrofobicidad fueron > 1 en ácidos húmicos y < 1 en fúlvicos. Los ácidos húmicos con mejor grado de condensación se encontraron en el Typic Melanudand |
| English abstract | In Andisols of the Cajibio municipalities, Cauca department and Sevilla, Valle del Cauca department, Colombia, the effect of soil use with forest Systems was evaluated, guadua (Guadua angustifolia K.), coffee crops (Coffea arábiga Caturra cultivar), with total sun exposure, shaded with guamo (Inga sp), walnut tree shadow and Brachiaria pasture over different organic matter compounds. Soil samples were taken in a Typic Melanudand located in the Cauca department to 1740 m.a.s.n. and a Typic Haplustand in Sevilla, Valle del Cauca, department to 1660 m.a.s.n. Soils were characterized by determination of physical and chemical properties; humic substances were obtained with sequential extraction solutions tetraborate, pyrophosphate and sodium hydroxide prior granulometric separation by wet sieving. Then purified and characterized humic and fulvic acids by different analytical and spectroscopic techniques. Were found significantly differences in the properties evaluated by the effect of the use and soil type. The higher acidity was performed at the Typic Melanudand (pH < 5.6). Typic Haplustand shows abrupt changes in going from slightly acidic pH (6.2) to highly acidic (< 5.5) by the change in land use. Typic Melanudand had higher organic carbon content. The humus was highert han fresh in both soils, yields on extraction of humic substances changed with soil use and content of humic acids was higher than the fulvic acids. Relations among both compounds showed differences E4/E6 use and soil type for humic and fulvic acids. Hydrophobicity indices were higher than 1.0 than humic acids and fulvic acids lower than 1.0. Acid fulvic performs a greatest condensation degrees in the Typic Melanudand soil |
| Disciplines: | Agrociencias |
| Keyword: | Suelos, Acidos fúlvicos, Acidos húmicos, Andisol, Fraccionamiento, Materia orgánica |
| Keyword: | Soils, Andisol, Fractionation, Fulvic acids, Humic acids, Organic matter |
| Full text: | Texto completo (Ver PDF) Texto completo (Ver HTML) |
