Differential physiological profiles at the soil particle size level explain the differences between no-till and conventional tillage agricultural managments of the same soil

FRENE JP; GABBARINI L; WALL LG

Milán

Simposio; 13th Symposium on Bacterial Genetics and Ecology - BAGECO13; 2015

Universidad de Milán

A long-term trial (27years-old at time of this sampling) comparing no till vs. conventional tillage was settled in a productive agricultural field (38º 07? 10.44? S; 62º 02? 23.50? W) in the south east of Argentinean Pampas (typic argiudoll soil). Tillage or no-tillage was the only difference between two joint plots of 6 Has each, everything else, crops, rotation, agrochemicals, everything else was similar between the two plots. Physical and chemical characterization of those plots show slight differences at the organic matter, water content and density levels. The activities of 5 enzymes clearly differentiate both soil managements both at 0-5 cm and 5-10 cm depth. Also did the measurements of physiological profiles at the community level measured by characterization of the oxygen consumption response after addition of 4 different C sources. Wet sieving fractionation (>63 μm, 63μm