Método Mehlich 3 como substituinte ao HCl para extração de Cobre e Zinco em solos com alto teor de matéria orgânica do sul do Brasil

Iron Availability in Tropical Soils and Iron Uptake by Plants

“…The Mehlich-1 extraction solution, composed of strong dilute acids, acts on labile and non-labile forms of metals, and is relevant in the evaluation of their availabilities (Abreu et al, 2007). The Mehlich-3 multielemental extraction method has also been the object of considerable study; the purpose of this extraction method is to simplify analytical procedures and reduce laboratory costs in routine analysis, due to its greater versatility (Schoninger et al, 2012). Nevertheless, results with diverse extractants are not yet consistent, and the correlation between concentrations in the soil and in the plant vary from low and not significant to high and significant for various crops (Rodrigues et al, 2001;Simonete and Kiehl, 2002;Abreu et al, 2004;Moreira et al, 2009).…”

Effects of cattle manure over the content, extraction and exportation of nutrients in snap bean

“…This result can be related to the fact that the addition of organic residuals increases the soil capability to donate and receive H + ions, increasing the buffering capacity and keeping the pH at values close to neutral. The organic residuals let N, K, Ca, Mg and B free in solution and reduce the availability of Zn, Fe and Cu to the plants (Pavinato and Rosolem, 2008;Silva et al, 2012a;Schoninger et al, 2012).…”

“…It is believed that the organic fertilization might had reduced the concentration of exchangeable zinc, iron and, mainly, copper due to complexation of these elements in the organic matter and, therefore, resulted in reduced concentrations in the leaf tissue (Silva et al, 2012a;Schoninger et al, 2012).…”