@article{Bramble:253321,
      recid = {253321},
      author = {Bramble, De Shorn and Gouveia, Gregory},
      title = {AN EVALUATION OF FACTORS AFFECTING THE CO2- C SINK  STRENGTH OF AG-LIME ADDED TO TWO TRINIDAD ACID SOILS},
      address = {2014},
      number = {538-2016-38610},
      pages = {12},
      year = {2014},
      abstract = {The most recent Intergovernmental Panel on Climate Change  (IPCC) greenhouse gas (GHG) inventory guidelines recognizes  that CO2 is not always the end product of ag-lime  dissolution in soils and now allows countries to report on  their own emission factors once it is supported by sound  research findings. This study was therefore established to  assess the effects of additions of  organic amendments  (biochar and poultry litter) and ammonium N on the  magnitude of the CO2 flux and the carbon sequestration  potential of ag-lime when added to two diverse soils (a  peaty clay and a sand). The soil treatments with the  equivalent of 80g oven dry soil (ODS) were incubated in  modified 500 mL mason jars. At each measurement, the  alkali-trap attached to the cover was installed ensuring  proper sealing of the jar opening and left for 24 hrs to  absorb the CO2 emitted from the soil. Fluxes were measured  at days 1, 3, 6, 9, 10, 15, 18, 21, 24, 28 and, 31, and all  soil treatments were initially brought to 100% field  capacity and rewetted three times thereafter. Analysis of  the data showed that soil type, organic matter and ag-lime  additions had a significant effect (P<0.05) on CO2  emissions. The effect of time was significant on the rates  of CO2 emissions, showing a decline in the emission rate  from an overall mean of 33.8 mg CO2/kgODS/hr at day 1 down  to 1.98 mg CO2/kgODS/hr. The peaty clay fluxes were  consistently higher than those from the sand, and soils  treated with poultry litter were also statistically  (P<0.05) consistently higher than those with biochar and no  organic matter additions. Given that ag-lime addition to  soil is known to have a priming effect on organic matter  decomposition, evidence for carbon sequestration was seen  with both soils; whereby the increase in CO2 emissions  following the addition of ag-lime was much lower in the  presence of poultry litter compared to soils with biochar  and no organic matter addition.},
      url = {http://ageconsearch.umn.edu/record/253321},
      doi = {https://doi.org/10.22004/ag.econ.253321},
}