The effect of zinc in soil tests with zinc and galvanized iron pots
1920
Conner, S.D.
In pot tests with acid soils in paraffined galvanized iron pots, crops began to fail the second seasons in an unexpected way. On testing the soils where the crops had failed, water-soluble zinc salts were found. Tests of the soils showed that the zinc was present in injurious amounts in the untreated or insufficiently limed soils, but not in the soils where sufficient lime had been used. The paraffine coating had been granulated and the soil acids and zinc salts had passed thru it. No good protective coating has yet been found. This action of acid soils on zinc is evidence that soils contain true acids.
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