Resumo
Some of the characteristics peculiar to Litosois are discussed based on data published on Litosois occurring in the States of São Paulo and Paraná. Litosois are the first stages of development of a soil. Litosois probably originate through the exposure of the rockbed caused by an excessive relief. Rock weathering processes are intensive, prevailing those of chemical nature rather than those processes in which physical phenomena dominate. The A horizon has a high organic matter content (2% to 10%). Silt and clay amount to approximately 50% of the fine earth in the A horizon, with the exception of Litosois originated from sandstone and granite. The SiO2/Al2O3 relationship of the soil's colloidal complex and the clay's cation exchange capacity indicate that it is quite probable the presence of 2:1 type clay in Litosois derived from basic rocks.
Centro de Estudos de Solos da Escola Superior de Agricultura "Luiz de Queiroz", USP
SUMMARY
Some of the characteristics peculiar to Litosois are discussed based on data published on Litosois occurring in the States of São Paulo and Paraná.
Litosois are the first stages of development of a soil. Litosois probably originate through the exposure of the rockbed caused by an excessive relief. Rock weathering processes are intensive, prevailing those of chemical nature rather than those processes in which physical phenomena dominate.
The A horizon has a high organic matter content (2% to 10%). Silt and clay amount to approximately 50% of the fine earth in the A horizon, with the exception of Litosois originated from sandstone and granite. The SiO2/Al2O3 relationship of the soil's colloidal complex and the clay's cation exchange capacity indicate that it is quite probable the presence of 2:1 type clay in Litosois derived from basic rocks.
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LITERATURA CITADA
Entregue para publicação em 27/12/67.
- COMISSÃO DE SOLOS, 1960 Levantamento de Reconhecimento dos Solos do Estado de São Paulo. Boletim nº 12 do Serviço Nacional de Pesquisas Agronômicas.
- PAULA SOUZA, D.M., 1964 Estudo Comparativo da Fertilidade, Grau de Laterização e Fixação de Fósforo em Solos da Região Cafeeira do Estado do Paraná. IBPT, Estado do Paraná (trabalho não publicado).
- JENNY, H., 1951 Factors of Soil Formation. McGraw Hill Book Co., New York, 2a. Ed, 281 p.
- LUTZ, H.J. & ROBERT F. CHANDLER, 1946 Forest Soils. John Wiley & Sons, Inc., London, 514 p.
- LYON, T.L., H.O. BUCKMAN & N.C. BRADY, 1952 The Nature and Properties of Soils. The MacMillan Co., New York, 5a. Ed., 591 p. U.S.D.A., 1938 Soils and Men. Yearbook of Agriculture. 1232p.
- SOIL SURVEY STAFF, 1952 Soil Survey Manual. U.S.D.A. Handbook nş 18, 503 p.
Litosol: suas características e provável gênese
Datas de Publicação
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Publicação nesta coleção
13 Jun 2012 -
Data do Fascículo
1967
