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- B13M-1725: Managing agricultural rock amendments for decadal-scale deployment
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Board 1725‚ Hall EFG (Poster Hall)NOLA CC
Author(s):Generic 'disconnected' Message
Tyler Kukla, CarbonPlan (First Author, Presenting Author)
Yoshiki Kanzaki, Georgia Institute of Technology
Freya Chay, CarbonPlan
Christopher Reinhard, Georgia Institute of Technology Main Campus
If enhanced weathering is going to be a successful carbon removal strategy at scale, we need to figure out how to spread rocks on fields in a sustainable way. Most enhanced weathering studies apply rock faster than it can dissolve, which could change the physical and chemical properties of the soil over time. These impacts could take decades to emerge, which is challenging to detect in field trials, but short enough to influence enhanced weathering operations at scale. We analyzed the long-term implications of repeated rock spreading using a model of soil physics and chemistry called SCEPTER. Many of our simulations found substantial changes in soil properties on timescales of decades, even at relatively low rates of rock application. Some of these changes could impact carbon removal or crop yields, and some are easy to fix while others could bring long-term effects that could be challenging to manage in some regions. Our results emphasize that if we want enhanced weathering to work at scale for many decades, we need a better understanding of how rock applications might need to change over time to account for the decadal evolution of the soil system.
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