Graph showing estimated changes in organic carbon in cropland soil in 5 year increments from 1981 to 2011. The trend shown is a slight overall decrease in the percentage of cropland with moderate to large loss of soil organic carbon over that period, but continuing loss of organic carbon on 80 per cent of cropland throughout the period. As well, there is a slight increase in the percent of area with no change in soil organic carbon, and no increases except on one per cent of cropland in 1996.



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