Boron adsorption in soils from the State of São Paulo, Brazil

Pesquisa Agropecuária Brasileira

LuÍs Reynaldo FerracciÚ Alleoni²  OtÁvio Antonio De Camargo¹ 

[1] ,ESALQ Dep. de Solos e Nutrição de Plantas Piracicaba SP ,Brazil

关键词: tropical soils;    simple correlation;    multiple regression analysis;    solos tropicais;    correlação simples;    regressão múltipla;   

DOI  :  10.1590/S0100-204X2000000200020

来源: SciELO

【 摘 要 】

Boron adsorption was studied in five representative soils (Rhodic Hapludox, Arenic Paleudalf and three Typic Hapludox) from the State of São Paulo, Brazil. Adsorption was higher in the clayey Oxisols, followed by the Alfisol and the coarser Oxisols. Calcium carbonate promoted an increase in the amount of adsorbed boron in all soils, with the most pronounced effect in the coarser-textured Oxisols. High correlation coefficients were found between adsorbed boron and clay and amorphous aluminum oxide contents and specific surface area (r = 0.79, 0.76 and 0.73, respectively, p < 0.01). Clay content, free aluminum oxide, and hot CaCl2 (0.01 mol L-1)-extracted boron explained 93% of the variation of adsorbed boron. Langmuir and Freundlich isotherms fitted well to the adsorbed data, and highest values for maximum boron adsorption were found in clayey soils, which were significantly correlated with contents of total, free and amorphous iron and aluminum oxides, as well with the physical attributes. Ninety four percent of the variation in the maximum adsorption could be related to the free iron content.

【 授权许可】

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