| http://www.w3.org/ns/prov#value | - While it was known to be worse on sandy and loamy soils (especially those derived from igneous rocks) than on heavier types, to be aggravated by fertilizer (such as sodium nitrate), and to be ameliorated by organic matter, still the disorder was a serious problem, and the basic cause was unknown until the aforementioned pioneer work of Chandler and others in California.
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