Light acidification in N-fertilized loess soils along a climosequence affected chemical and mineralogical properties in the short-term
Some evidences indicate that N-fertilization of crops decreased pH values of loess soils of the Argentinean Pampas in the last decades. We analyzed the A-horizons of four N-fertilized (F) and non-fertilized (NF) paired soils, developed on similar parent materials, within a climatic sequence (ustic t...
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| Format: | Artículo |
| Language: | Inglés |
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Elsevier
2018
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| Online Access: | http://hdl.handle.net/20.500.12123/3845 https://www.sciencedirect.com/science/article/pii/S0341816215301740?via%3Dihub https://doi.org/10.1016/j.catena.2015.12.007 |
| _version_ | 1855483315311607808 |
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| author | Iturri, Laura Antonela Buschiazzo, Daniel Eduardo |
| author_browse | Buschiazzo, Daniel Eduardo Iturri, Laura Antonela |
| author_facet | Iturri, Laura Antonela Buschiazzo, Daniel Eduardo |
| author_sort | Iturri, Laura Antonela |
| collection | INTA Digital |
| description | Some evidences indicate that N-fertilization of crops decreased pH values of loess soils of the Argentinean Pampas in the last decades. We analyzed the A-horizons of four N-fertilized (F) and non-fertilized (NF) paired soils, developed on similar parent materials, within a climatic sequence (ustic to udic water regimes), and measured: 1) the extent of pH changes, 2) how these changes affected chemical and mineralogical soil properties and 3) how the soils, according to their H+ buffering substances, can react in the future if N-fertilization and acidification continue. Results indicated that all F- and NF soils were lightly acidified (differences between pHW and pHKCl higher than 1.0) and that fertilization produced pH decreases in all studied soils, but particularly in those with udic water regimes, in agreement with their longer N-fertilization histories. Fertilized ustic soils showed less crystalline illites and kaolinites and higher contents of amorphous Al oxides than NF soils. It remains unclear if the higher contents of amorphous Al are related with the dissolution of phyllosilicates, the transformation of the abundant volcanic glasses of these soils or both processes at the same time. The cation exchange capacity (CEC) and the percent of base saturation (V) did not change between F- and NF soils, probably due to the large influence of soil organic matter (SOM) in the studied soils. If N-fertilization, and consequently pH decreases continue, soils placed in both the moistest- (Argiudolls) and the driest extremes of the climosequence (Haplustolls) would be the less affected. This is because udic soils contain high SOM as well as illitic clays and silts while ustic soils contain free lime and high density charged clay minerals, which have high H+ neutralization capacity. The most affected soils by acidification should be those placed in the intermediate zone of the climosequence (Hapludolls), which have low amounts of substances with high buffer capacity. |
| format | Artículo |
| id | INTA3845 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | INTA38452018-11-09T13:12:25Z Light acidification in N-fertilized loess soils along a climosequence affected chemical and mineralogical properties in the short-term Iturri, Laura Antonela Buschiazzo, Daniel Eduardo Loess Soils Acidification Nitrogen Fertilizers Soil Chemicophysical Properties Climatic Factors Loess Acidificación Abonos Nitrogenados Propiedades Físico-Químicas Suelo Factores Climáticos Short-term Soil Acidification Soil Buffer Capacity Some evidences indicate that N-fertilization of crops decreased pH values of loess soils of the Argentinean Pampas in the last decades. We analyzed the A-horizons of four N-fertilized (F) and non-fertilized (NF) paired soils, developed on similar parent materials, within a climatic sequence (ustic to udic water regimes), and measured: 1) the extent of pH changes, 2) how these changes affected chemical and mineralogical soil properties and 3) how the soils, according to their H+ buffering substances, can react in the future if N-fertilization and acidification continue. Results indicated that all F- and NF soils were lightly acidified (differences between pHW and pHKCl higher than 1.0) and that fertilization produced pH decreases in all studied soils, but particularly in those with udic water regimes, in agreement with their longer N-fertilization histories. Fertilized ustic soils showed less crystalline illites and kaolinites and higher contents of amorphous Al oxides than NF soils. It remains unclear if the higher contents of amorphous Al are related with the dissolution of phyllosilicates, the transformation of the abundant volcanic glasses of these soils or both processes at the same time. The cation exchange capacity (CEC) and the percent of base saturation (V) did not change between F- and NF soils, probably due to the large influence of soil organic matter (SOM) in the studied soils. If N-fertilization, and consequently pH decreases continue, soils placed in both the moistest- (Argiudolls) and the driest extremes of the climosequence (Haplustolls) would be the less affected. This is because udic soils contain high SOM as well as illitic clays and silts while ustic soils contain free lime and high density charged clay minerals, which have high H+ neutralization capacity. The most affected soils by acidification should be those placed in the intermediate zone of the climosequence (Hapludolls), which have low amounts of substances with high buffer capacity. EEA Anguil Fil: Iturri, Laura Antonela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentina. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales; Argentina Fil: Buschiazzo, Daniel Eduardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Anguil; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; Argentina 2018-11-09T13:08:31Z 2018-11-09T13:08:31Z 2016-04 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/3845 https://www.sciencedirect.com/science/article/pii/S0341816215301740?via%3Dihub 0341-8162 https://doi.org/10.1016/j.catena.2015.12.007 eng info:eu-repo/semantics/restrictedAccess application/pdf Elsevier CATENA 139 : 92-98. (April 2016) |
| spellingShingle | Loess Soils Acidification Nitrogen Fertilizers Soil Chemicophysical Properties Climatic Factors Loess Acidificación Abonos Nitrogenados Propiedades Físico-Químicas Suelo Factores Climáticos Short-term Soil Acidification Soil Buffer Capacity Iturri, Laura Antonela Buschiazzo, Daniel Eduardo Light acidification in N-fertilized loess soils along a climosequence affected chemical and mineralogical properties in the short-term |
| title | Light acidification in N-fertilized loess soils along a climosequence affected chemical and mineralogical properties in the short-term |
| title_full | Light acidification in N-fertilized loess soils along a climosequence affected chemical and mineralogical properties in the short-term |
| title_fullStr | Light acidification in N-fertilized loess soils along a climosequence affected chemical and mineralogical properties in the short-term |
| title_full_unstemmed | Light acidification in N-fertilized loess soils along a climosequence affected chemical and mineralogical properties in the short-term |
| title_short | Light acidification in N-fertilized loess soils along a climosequence affected chemical and mineralogical properties in the short-term |
| title_sort | light acidification in n fertilized loess soils along a climosequence affected chemical and mineralogical properties in the short term |
| topic | Loess Soils Acidification Nitrogen Fertilizers Soil Chemicophysical Properties Climatic Factors Loess Acidificación Abonos Nitrogenados Propiedades Físico-Químicas Suelo Factores Climáticos Short-term Soil Acidification Soil Buffer Capacity |
| url | http://hdl.handle.net/20.500.12123/3845 https://www.sciencedirect.com/science/article/pii/S0341816215301740?via%3Dihub https://doi.org/10.1016/j.catena.2015.12.007 |
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