Edafo- climate factors in the variability of nutrients in an Argentine Republic Soil

RIVERO, EMILIA; CRUZATE, GUSTAVO; RUSSO, SUSANA; BELTRÁN, MARCELO; MICHELENA, ROBERTO; BOSCO, TOMÁS

Florida

Simposio; Climate information from management risks; 2011

University of Florida. Southeast climate consortium, Florida Climate Institue

 The objective of this study was to evaluate the effect of some soil and climate factors on the variability of phosphorus (P), potassium (K), manganese (Mn), zinc (Zn) availability in a soil of the Argentine Pampas. In Paraná, Entre Rios Province a soil classified as Vertic Argiudoll was sampled in two different seasons, spring (2006) and autumn (2007). A plot of a hectare was sampled with a 25 cell grid, collecting compound samples in two depths (0-5 and 5-20 cm) around the centre of each cell prior to sowing and after harvest. The availability of nutrients from 0-20 cm was estimated based on a weighted average of data for the other depths. Chemical determination were made using the standard routine methods of the laboratory of the INTA Institute of Soils. Rainfall and temperature data sets were provided by INTA Climate Institute from Paraná. The results showed that: 1) The spatial variability of available P was classified very high for both seasons. 2)  The availability of P could be incremented by the fertilization and in spite of the rainfall occurred in autumn, P was not leached because of its lower mobility. 3) The spatial variability of available Zn varied from very high in spring to medium in autumn. 4) The decrease in the variability of Zn in the second sampling would be related to the contribution of the organic matter which equalized the levels between cells.