Cobalt and sorbed complex of the soils of the soil Unit Utinga

• Autor(a) principal: Dantas, Humberto da Silveira
• Data de Publicação: 2014
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/17589

Considering the development of livestock production in the Litoral Mata area of Pernambuco and Alagoas, and the significance of mineral elements in animal nutrition, the author has studied some soils to detect cobalt as well as macroelements deficiencies. Representative "Unidade Utinga" soils from coastal Pernambuco and Alagoas were collected and analysed through spectrophotometry, flamephotometry and other methods. According to the classification referred to by Reddy and Mahte, 1961, these soils proved to be deficient in total cobalt (less than 2.5 ppm, flueridric extract), as well as in soluble cobalt (less than 0.1 ppm, CH2COONH4 1 N and CH3COOH 0,5 N extract). Of the interchangeable cations, K+, Na+, Ca2+ and Mg2+ no one was emphasized, although Ca was predominant over the others. Since manganese is non toxic (Dantas 1971) attention should be called to Al2+, although the causes of toxicity of acid soils are not very well established yet. According to Carr and Torekin (1961), Co has a tendency to be associated to mangnesium more than with iron (II) and so the largest part of cobalt in the granitic rocks is concentrated in the ferromagnesian minerals. The analytic e values are in Tables 1 and 2.