01-12-2012, 05:40 PM
Soil Carbon Sequestration: Long-term Effect of Tillage and Rotations
1Soil Carbon Sequestration.ppt (Size: 2.49 MB / Downloads: 84)
Agriculture
A large proportion of the mitigation potential of agriculture (excluding bioenergy) arises from soil C sequestration, which has strong synergies with sustainable agriculture and generally reduces vulnerability to climate change.
Agricultural practices collectively can make a significant contribution at low cost
By increasing soil carbon sinks,
By reducing GHG emissions,
By contributing biomass feedstocks for energy use
Corn production in NE Kansas
Continuous corn
168 kg N/ha
Tillage Systems
No-tillage
Conservation tillage (Chisel-disk)
15 year analysis
Summary
Soil C sequestration
Need to examine the system
Less disturbance
Organic C inputs
No-tillage must be combined with residues
Residue removal in no-till may be worst than tillage with residue
Agricultural soil C sequestration
Keeps land in production in some cases
In many cases increases profitability for the farmer
Provides other environmental benefits to society
Soil and Water quality (less runoff, less erosion)
May help adapt to climate change as well as mitigate