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Supertopics:
Soil (Dirt)
pH (potential of hydrogen) - Acidic vs Alkaline

Soil pH

Subtopics and Documents:
Remediating Soil pH
food crops to grow in acidic soil
webJulie COff the Grid News2013-06-19
modifying soil pH
webSunset Magazine2012-10-01
earthworms are declining on manure, acidic soil, and tilling
webDW2017-01-30