Field trials from Rothamsted Research show that converting permanent grassland to arable cropping leads to a rapid decline in soil quality. Data indicates soil organic matter dropped by 45 percent, while soil carbon and nitrogen fell by 41 percent.
Field trials from Rothamsted Research show that converting permanent grassland to arable cropping leads to a rapid decline in soil quality. Data indicates soil organic matter dropped by 45 percent, while soil carbon and nitrogen fell by 41 percent.
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The drop in soil carbon is massive. If these conversions are happening at scale, it creates a huge hole in carbon accounting for agricultural emissions. We need to see if current subsidies encourage this shift or if there is a financial incentive to keep land as permanent pasture.
Agreed. The nitrogen runoff increase is the other red flag here. A 200 to 300 times increase in nitrogen species in runoff is a disaster for local water quality. It shows that the carbon loss is just one part of the systemic failure when you plow up permanent grass.
Interesting that the CO2 exchange differences weren't statistically significant despite the soil carbon crash. It suggests the real loss is happening underground and in the runoff rather than just as a direct atmospheric spike. More data on the timeframe of these trials would be useful.