PM10 EMISSIONS FROM AN ENTIC HAPLUSTOLL UNDER DIFFERENT TILLAGE SYSTEMS

MENDEZ MJ; PANEBIANCO JUAN ESTEBAN; BUSCHIAZZO DANIEL EDUARDO

Lanzhou

Conferencia; Eighth International Conference on Aeolian Research (ICAR VIII); 2014

International Society for Aeolian Research

Tillage operation of agricultural soils is an important source of PM10 emissions to the atmosphere in the semiarid argentinian Pampas. Susceptibility of the soil to PM10 emission are largely dependent of soil surface conditions affected on tillage operations. Because of that aims of this study was to evaluate PM10 emission amounts in a soil submitted to contrasting tillage systems. Three samples were taken from the 3cm topsoil of an Entic Haplustoll submitted to 10 years of continuous conventional tillage (CT) and no-till (NT) in order to determine the dry aggregate size distribution (>19.2 mm, 6.4-19.2 mm, 6.4-2 mm, 2-0.84 mm, 0.84-0.42 mm and < 0.42 mm), the erodible fraction (EF, 19.2 mm, 6.4-19.2 mm and < 0.42 mm sized aggregates predominated in both tillage systems (34%, 24% and 25% respectively). The < 0.42 mm-sized aggregates were higher in CT (24%) than in NT (14%). EF was higher in CT (25%) than NT (17%), while the opposite occurred for EE (91% in NT and 81% in CT). The 2-6.4 mm sized aggregates were more enriched in OM (3.5-6.3%) in both tillage systems. OM contents of NT (3.0-3.5%) were higher than those of CT (4.2-6.3%) in all analyzed fractions. PM10 emissions of > 0.42 mm sized aggregates were the highest in both tillage systems. All aggregate fractions emitted more PM10 from CT than from NT. This agrees with their higher EE and OM contents. The PM10 emission index was in NT lower than CT (2.5 and 7.1 ug PM10 per g of soil respectively), due to lower proportion of