Temporal change of soil pH An increasing trend of the proportion of the acidic soils (5.5 > pH > 4.5) while a decreasing trend of the proportion of weakly acidic soils (6.5 > pH > 5.5) were observed for 10 out of 11 divisions (except PingXiang) over the past 30-year period (Fig. 3 ).
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Drivers of spatio-temporal changes in paddy soil pH in Jiangxi Province, China from 1980 to 2010.
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