Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados
In the Cerrados, a large savanna region in Brazil, the effects of different land use on aggregation in Oxisols were studied, using laser diffraction grain-size analyses. The topsoil of plowed systems had significantly fewer macroaggregates (194-2000 micro m) and a significantly larger fraction of mi...
| Main Authors: | , , , , , |
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| Format: | Book Chapter |
| Language: | Inglés |
| Published: |
International Center for Tropical Agriculture
1999
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/55128 |
| _version_ | 1855530125561430016 |
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| author | Westerhof, R Buurman, P Griethuysen, C. van Ayarza, Miguel Angel Vilela, Lourival Zech, W. |
| author_browse | Ayarza, Miguel Angel Buurman, P Griethuysen, C. van Vilela, Lourival Westerhof, R Zech, W. |
| author_facet | Westerhof, R Buurman, P Griethuysen, C. van Ayarza, Miguel Angel Vilela, Lourival Zech, W. |
| author_sort | Westerhof, R |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | In the Cerrados, a large savanna region in Brazil, the effects of different land use on aggregation in Oxisols were studied, using laser diffraction grain-size analyses. The topsoil of plowed systems had significantly fewer macroaggregates (194-2000 micro m) and a significantly larger fraction of microaggregates and primary particles (<76 micro m) than did pastures and native savanna. In plowed systems that were low in soil organic carbon (SOC), lime negatively affected aggregate stability. Lime addition had no effect on topsoil aggregation in land-use systems that were irregularly plowed and generally had a higher SOC content. For all the studied topsoils, pH KCl was positively correlated with the amount of clay dispersed after 3 h of shaking in water. Soil organic carbon did not influence clay dispersion in the range of soils studied. In continuous cropping systems in the Cerrados, a combination of mechanical stress, low SOC, and liming will increase the number of small aggregates and primary particles and hence contribute to destabilizing the soil structure. |
| format | Book Chapter |
| id | CGSpace55128 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1999 |
| publishDateRange | 1999 |
| publishDateSort | 1999 |
| publisher | International Center for Tropical Agriculture |
| publisherStr | International Center for Tropical Agriculture |
| record_format | dspace |
| spelling | CGSpace551282024-01-17T12:58:34Z Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados Westerhof, R Buurman, P Griethuysen, C. van Ayarza, Miguel Angel Vilela, Lourival Zech, W. savannas soil structure oxisols soil organic matter sabanas estructura del suelo oxisoles materia orgánica del suelo In the Cerrados, a large savanna region in Brazil, the effects of different land use on aggregation in Oxisols were studied, using laser diffraction grain-size analyses. The topsoil of plowed systems had significantly fewer macroaggregates (194-2000 micro m) and a significantly larger fraction of microaggregates and primary particles (<76 micro m) than did pastures and native savanna. In plowed systems that were low in soil organic carbon (SOC), lime negatively affected aggregate stability. Lime addition had no effect on topsoil aggregation in land-use systems that were irregularly plowed and generally had a higher SOC content. For all the studied topsoils, pH KCl was positively correlated with the amount of clay dispersed after 3 h of shaking in water. Soil organic carbon did not influence clay dispersion in the range of soils studied. In continuous cropping systems in the Cerrados, a combination of mechanical stress, low SOC, and liming will increase the number of small aggregates and primary particles and hence contribute to destabilizing the soil structure. 1999 2015-01-28T14:17:27Z 2015-01-28T14:17:27Z Book Chapter https://hdl.handle.net/10568/55128 en Open Access International Center for Tropical Agriculture Westerhof, Roelof; Buurman, Peter; Van Griethuysen, Corine; Ayarza, Miguel Angel; Vilela, Lourival; Zech, Wolfgang. 1999. Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados. In: Thomas, Richard J.; Ayarza, Miguel Angel (eds.). Sustainable land management for the oxisols of the Latin American savannas: Dynamics of soil organic matter and indicators of soil quality. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. p. 64-76. (CIAT publication no. 312) |
| spellingShingle | savannas soil structure oxisols soil organic matter sabanas estructura del suelo oxisoles materia orgánica del suelo Westerhof, R Buurman, P Griethuysen, C. van Ayarza, Miguel Angel Vilela, Lourival Zech, W. Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados |
| title | Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados |
| title_full | Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados |
| title_fullStr | Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados |
| title_full_unstemmed | Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados |
| title_short | Aggregation studied by laser diffraction in relation to plowing, soil organic matter, and lime in the Brazilian cerrados |
| title_sort | aggregation studied by laser diffraction in relation to plowing soil organic matter and lime in the brazilian cerrados |
| topic | savannas soil structure oxisols soil organic matter sabanas estructura del suelo oxisoles materia orgánica del suelo |
| url | https://hdl.handle.net/10568/55128 |
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