Relação entre matéria orgânica e textura de solos sob cultivo de algodão e cana-de-açúcar, no estado de São Paulo

Lepsch, Igo Fernando; Silva, Nelson Machado da; Espironelo, Ademar

Relação entre matéria orgânica e textura de solos sob cultivo de algodão e cana-de-açúcar, no estado de São Paulo

1982

Lepsch, Igo Fernando(Instituto Agronômico Seção de Pedologia) | Silva, Nelson Machado da(Instituto Agronômico Seção de Algodão) | Espironelo, Ademar(Instituto Agronômico Seção de Cana-de-Açúcar)

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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