The effect of different soil management procedures on carbon cycle components in an entic hapludoll.
Costantini A. | Segat A. | Cosentino D.
Sampling on different plots of a field located in Pehuajo, Buenos Aires Province, Argentina, on an Entic Hapludoll, was conducted to determine the effect of different soil management procedures on carbon cycle components. The plots studied were: A) eight years of mixed pasture followed by oat (Avena sativa L.) crop, B) five years of mixed pasture followed by maize (Zea mays L.) with direct drilling, and C) five years of mixed pasture followed by maize crop with conventional tillage. The sampling was done during the month of June 1994. By that time, plot A was in oat production and plots B and C were in fallow. Microbial biomass carbon (MBC) values differed significantly between the three plots, whereas no differences were found in the organic carbon (OC) content. Plots B and C differed both in respiration and qCO2 (the ratio between C-CO2 released by respiration and the microbial biomass C). For the latter, no differences had been found as a function of the tillage system in a previous work that was carried out on another region of Argentina. Theoretical calculations on the CO2 release from the soil to the atmosphere were inferred from the respiration values previously found.
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