The Cr concentrations in approximately 75% of the soil and wheat samples showed an increasing trend with the lower quartiles of their change rates greater than 0 during the next two years (2015–2017).
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Simulation of Heavy Metals Migration in Soil-Wheat System of Mining Area.
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The sentences
There was a decreasing trend of the Pb concentrations in more than 50% soil samples, but an increasing trend was found in over 75% wheat samples between 2015 and 2016.