Resumo
In the plow layer (0-20cm) of well drained low activity clay soils (mostly Oxisols and Ultisols) under "Cwa" tropical climate and long term cropped with cotton (42 sites) or sugarcane (45 sites), organic matter (y) was found to be similarly and highly related to soil texture. Best relations were found with clay (<2µ) plus silt (2-20µ) contents (x); (y = 0.773 + 0.0325x; r = 0.810***). A classification of soil organic matter contents, into low, medium and high levels, with different values for four major textural Classes is suggested. Ranges of medium levels of organic matter suggested were: 0.6 to 1.2% for sand and sandy loam; 1.0 to 1.8% for sandy loam and sandy clay loam; 1.5 to 2.8% for sandy clay and clay; 2.4 to 3.8% for heavy clay.
NOTAS
Relação entre matéria orgânica e textura de solos sob cultivo de algodão e cana-de-açúcar, no estado de São Paulo
Organic matter as related to texture in soils cropped with cotton and sugarcane in São Paulo state, Brazil
Igo Fernando LepschI; Nelson Machado da SilvaII; Ademar EspironeloIII
ISeção de Pedologia, IAC
IISeção de Algodão, IAC
IIISeção de Cana-de-Açúcar, Instituto Agronômico, IAC
SUMMARY
In the plow layer (0-20cm) of well drained low activity clay soils (mostly Oxisols and Ultisols) under "Cwa" tropical climate and long term cropped with cotton (42 sites) or sugarcane (45 sites), organic matter (y) was found to be similarly and highly related to soil texture. Best relations were found with clay (<2µ) plus silt (2-20µ) contents (x); (y = 0.773 + 0.0325x; r = 0.810***). A classification of soil organic matter contents, into low, medium and high levels, with different values for four major textural Classes is suggested. Ranges of medium levels of organic matter suggested were: 0.6 to 1.2% for sand and sandy loam; 1.0 to 1.8% for sandy loam and sandy clay loam; 1.5 to 2.8% for sandy clay and clay; 2.4 to 3.8% for heavy clay.
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Recebido para publicação a 26 de agosto de 1981.
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6SOCIEDADE BRASILEIRA DE CIÊNCIA DO SOLO. Comissão Permanente de Métodos de Trabalho de Campo. Manual de método de trabalho de Campo: 2.ª aproximação. Rio de Janeiro, Divisão de Pedologia e Fertilidade do Solo, 1967. 33p.
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Datas de Publicação
-
Publicação nesta coleção
17 Dez 2007 -
Data do Fascículo
1982
Histórico
-
Recebido
26 Ago 1981
