a soil of acid reaction or having a predominance of hydrogen ions, tasting sour in solution.
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British Dictionary definitions for acid soil
a soil that gives a pH reaction of below about 6, found especially in cool moist areas where soluble bases are leached away
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012