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|Unidade da Embrapa/Coleção::||Área de Informação da Sede - Artigo em periódico indexado (ALICE)|
|Data do documento:||5-Out-1998|
|Tipo do Material:||Artigo em periódico indexado (ALICE)|
|Autoria:||LIMA, J. M. de|
ANDERSON, S. J.
PIERCE, F. J.
|Título:||Improvement of properties, and water and clay movement in vertisol-amended sand columns.|
|Fonte/Imprenta:||Pesquisa Agropecuaria Brasileira, Brasilia, v.33, n.7, p.1171-77, jul, 1998.|
|Palavras-chave:||Retencao de agua|
|Conteúdo:||Clay amendments may improve agricultural productivity of sandy soils by increasing nutrient-and water-holding capacities. The objective of this research was to determine the effect of Vertisol amendments on infiltration rate, available water capacity, cation exchange capacity, and clay and carbon migration in sandy soil colums. Acid-washed quartz sand was packed into PVC columns and covered with 10 cm of a Vertisol-sand mixture that contained 50, 100, 200 or 400 g kg of the Ap horizon of a Vertisol (fine, montmorillotic, thermic typic chromoxerests). Water was applied every other day, Leachate volume and dissolved organic carbon were measured biweekly. After 10 weeks, columns were selectioned into four layers, and chemical and physical properties were measured in each layer. Water retention, water capacity, and cation exchange capacity increased with increasing vertisol content. Dissolved organic C in column leachates also increased with increasing Vertison concentration and decreased with time. The 400 g kg Vertisol mixture had extremely low infiltration rate, possibly, because of surface crusting. The results of this study suggest that the 200 g kg Vertisol mixture had the overal physical and chemical properties most conductive to improved agricultural productivity with reasonable infiltration rate.|
|NAL Thesaurus:||sandy soils.|
|Ano de Publicação:||1998|
|Aparece nas coleções:||Artigo em periódico indexado (AI-SEDE) / Embrapa Informação Tecnológica (SCT)|
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|IMPROVEMENTOFPROPERTIESANDWATERANDCLAYMOVEMENT.pdf||185,52 kB||Adobe PDF|