A preliminary study of ten soils selected from the commercial potato-growing area showed that scabbiness was generally associated with high pH levels and with wide Ca:K ratios.In a greenhouse study, the effect of Ca:K ratio was studied independently of pH by using calcium hydroxide and calcium sulphate as sources of calcium. Scabbiness was directly related to soil pH but was not related to Ca:K ratio.
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Doyle et al. (1960) studied this question.