Disponibilidad de cinc, cobre, hierro y manganeso extraíble con DTPA en suelos de córdoba (Argentina) y variables edáficas que la condicionan

Cu, Zn, Fe and Mn DTPA extractable content and it relationship with organic matter, pH, salinity and lime were studied in 48 soils (Mollisol, Entisol and Alfisol) from some geomorphic regions of the Chaco-Pampean plain of Cordoba (Argentina). Soils ranged from silty loam to loamy sandy texture, weak acidity to strong alcalinity, and low to medium salinity, they were sampled from 0 to 60 cm depth. Copper were at its critical range (0,1-1 mg.kg -1 ) only in sandy soils, with the highest contents (1.5 -2.5 mg kg -1 ) in Argiudolls. Zinc was below 1 mg kg -1 in most regions. Manganese (2385 mg kg -1 ) and Fe (21-68 mg kg -1 ) were above their respective critical content in all regions, with highest contents in Argiudolls for both micronutrients. Zn, Cu and Mn distribution in depth profile, was associated with organic matter content. Soil variables lime and pH for Cu, and OM and salinity for Zn, were positively correlated with DTPA content.