217-6 Soil CO2 Emission Resulting From Application Of Sewage Sludge Under No-Till.
Poster Number 1212
See more from this Division: ASA Section: Environmental Quality
See more from this Session: Carbon Emissions From Agriculture
Tuesday, November 5, 2013
Tampa Convention Center, East Exhibit Hall
Abstract:
The experiment has as main aim to assess the CO2 emissions resulting from application of sewage sludge from a long-time in area under no-till, in Botucatu, State of São Paulo, Brazil. Two types of sewage sludge (centrifuged and biodigested) and four rates applied on soil surface (0, 2, 4 and 8 Mg ha-1) have been evaluating, with four replicates. Soil CO2 emission was measured at 1, 3, 5, 8, 15, 30, 60 and 120 days after sowing of soybean 2012/13, using an Automated Flux CO2 Soil System, model LI-8100A. At the same dates, soil moisture and temperature were measured. The sewage sludge rates have not increased the soil CO2 emission. As regards to the sludge, the centrifuged sludge promoted greater rates of soil CO2 emission at 5, 8, 15 and 60 days after soybean sowing (3.8, 2.6, 4.0 and 6.2 mol m-2 s-1, respectively). That result may be explained, in part, by soil moisture, which was higher for centrifuged sludge plots. The soil moisture showed significant correlation with the soil CO2 emission (r = 0.29**). The temperature showed a correlation of -0.15* with the soil CO2 emission and it seems to have no relation with the results.
See more from this Division: ASA Section: Environmental Quality
See more from this Session: Carbon Emissions From Agriculture