Some Edafo- Climatic Effect on Variability of S and B in an Argentine Republic Soil

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

Florida

Simposio; Climate information from management risks; 2011

University of Florida. Southeast climate consortium, Florida Climate Institute

The objective of this study was to assess the effect of some soil and climate factors like pH, organic matter (OM), rainfall and temperature in the variability of the availability of sulfur  (S) and boron (B) in soil. In San Andres de Giles, Buenos Aires, a soil classified as Vertic Argiudoll was sampled in two different years (2008 and 2009) before soybean sowing under no tillage system. A plot of a hectare was sampled with a 25 cell grid, collecting compound samples in two depths (0-5 and 5-20 cm) and the availability of the nutrient from 0-20 cm was estimated on a weighted average of data for the other depths. Chemical determinations were made using the standard laboratory methods routine of the INTA Institute of Soils. Climate data were provided by the INTA Climate Institute. The results showed that in 2009: The increase on the precipitations influenced B leaching to deeper layers and in most cells deficiencies of B were found because of it. On the other hand, S as a semi-mobile nutrient was probably not as leached as B by rainfall. Moreover, the increase in pH and OM could have mineralized an amount of S that could have compensated the nutrient leached.  Finally, the variability for  both elements was lower this year and corresponds to the rainiest spring.