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dc.contributor.author
Bongiovanni, Marcos D.  
dc.contributor.author
Lobartini, Juan Carlos  
dc.date.available
2020-01-09T20:43:18Z  
dc.date.issued
2006-12  
dc.identifier.citation
Bongiovanni, Marcos D.; Lobartini, Juan Carlos; Particulate organic matter, carbohydrate, humic acid contents in soil macro- and microaggregates as affected by cultivation; Elsevier Science; Geoderma; 136; 3-4; 12-2006; 660-665  
dc.identifier.issn
0016-7061  
dc.identifier.uri
http://hdl.handle.net/11336/94242  
dc.description.abstract
Cultivation is known to strongly affect not only soil structure but also organic substances responsible for aggregation. This research was conducted to study the effect of cultivation on the distribution of soil macro- and microaggregates as related to changes in soil organic matter content in a Typic Haplustoll, located in central Cordoba, the principal peanut (Arachis hypogaea L.) growing area of Argentina. Samples were taken from A or Ap horizons at (1) an undisturbed and (2) a cultivated site for determination of the aggregate fractions by the wet sieving method. The mineral associated organic carbon (MOC) and particulate organic carbon (POC), in soils and their aggregates, were separated by dispersion and sieving procedures. Carbohydrate content in soil and in aggregate fractions was determined by dilute acid (CHda) and hot water (CHhw) extraction, whereas humic (HA) and fulvic acid (FA) were extracted by the NaOH method. The results indicated that the total macroaggregates (> 250 μm) content was 1.7 times lower in the cultivated than in the undisturbed soil. The large macroaggregates (2800-2000 μm) were the most affected, decreasing a 92% due to cultivation compared with undisturbed. In contrast, the microaggregate (250-53 μm) content was twice that high in the cultivated than in the undisturbed soil. The concentrations of OC, POC, CHda, CHhw were all reduced substantially by cultivation, with the microaggregates showing an almost complete loss of its POC content. The destruction of these transient organic cementing agents was assumed to have contributed to the collapse of the macroaggregates. This has resulted in exposure of POC, making it more available to rapid oxidation and microbial attack. There were indications suggesting POC and CHhw contents to be valuable as indicators of soil structure degradation due to exhaustive cultivation practices. Although it is well know that humic substances are chemically and structurally much more stable than nonhumic substances but our results showed a surprising decrease humic substances under continuous cultivation.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier Science  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/  
dc.subject
AGGREGATES  
dc.subject
CULTIVATION  
dc.subject
HUMIC SUBSTANCES  
dc.subject
ORGANIC MATTER  
dc.subject
SOIL DEGRADATION  
dc.subject.classification
Otras Ciencias Agrícolas  
dc.subject.classification
Otras Ciencias Agrícolas  
dc.subject.classification
CIENCIAS AGRÍCOLAS  
dc.title
Particulate organic matter, carbohydrate, humic acid contents in soil macro- and microaggregates as affected by cultivation  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2019-11-25T18:43:36Z  
dc.journal.volume
136  
dc.journal.number
3-4  
dc.journal.pagination
660-665  
dc.journal.pais
Países Bajos  
dc.journal.ciudad
Amsterdam  
dc.description.fil
Fil: Bongiovanni, Marcos D.. Universidad Nacional de Río Cuarto; Argentina  
dc.description.fil
Fil: Lobartini, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Agronomía; Argentina  
dc.journal.title
Geoderma  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0016706106001613  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.geoderma.2006.05.002