Conclusions
In these rather simple exploratory tests, no reason was found for believing that lime has any effect on potato scab other than through its effect on the alkalinity of the soil.
The general relation of acidity of the soil to scab was similar to that previously reported from a field survey.
The amount of scab was reduced by extremely heavy applications of lime giving pH values of the soil (about 9.0) higher than those found on the survey (8.0–8.3) where scab was not troublesome.
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Blodgett, F.M., Cowan, E.K. Relative effects of calcium and acidity of the soil on the occurrence of potato scab. American Potato Journal 12, 265–274 (1935). https://doi.org/10.1007/BF02890822
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DOI: https://doi.org/10.1007/BF02890822