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Relação entre acidez do solo e queima de folhas da soja por cloreto de potássio

Relationship between soil acidity and burning of leaves of soybeans by potassium chloride

NOTAS

Relação entre acidez do solo e queima de folhas da soja por cloreto de potássio

Relationship between soil acidity and burning of leaves of soybeans by potassium chloride

Hipólito A. A. MascarenhasI, * * Com bolsa de suplementação do CNPq. ; Rúter HiroceII; José Guilherme de FreitasIII; Antonio Wilson P. Ferreira FilhoIII

ISeção de Leguminosas, IAC

IISeção de Química Analítica, IAC

IIISeção de Arroz e Cereais de Inverno, Instituto Agronômico, IAC

SUMMARY

Big patches of symptoms of burning of soybean leaves, cultivars Paraná, planted in large commercial scale were observed in the Maracaí County, SP — Brazil. The results of soil analysis, near the plants that with symptoms of burning of leaves, showed low pH, high Al content and low contents of Ca and Mg. The leaf analysis showed high concentrations of Fe and excess of Mn. In plants where there were no leaf symptoms the soil analysis showed higher pH, low quantity of Al, high quantity of Ca and Mg contents while the leaf analysis showed high concentrations of Fe and Mn but not in excess. Although the K content in the soil in both cases was high, excessive concentration of K and Cl were observed in leaves with symptoms. In the case of plants without symptoms there was a antagonistic effect of Ca and Mg on the leaf concentration of K and consequently on Cl. Due to soil acidity, shallow root system were observed in plants with symptoms, and, with the drought of 8-10 days, there was greater absorption, of K and Cl which was responsible for the leaf burn.

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Recebida para publicação a 11 de abril de 1980.

  • *
    Com bolsa de suplementação do CNPq.
  • Datas de Publicação

    • Publicação nesta coleção
      21 Dez 2007
    • Data do Fascículo
      1980
    Instituto Agronômico de Campinas Avenida Barão de Itapura, 1481, 13020-902, Tel.: +55 19 2137-0653, Fax: +55 19 2137-0666 - Campinas - SP - Brazil
    E-mail: bragantia@iac.sp.gov.br