Seventeen experiments in 1957–59 on the Lincolnshire Limestone soils tested the response of sugar beet to 2·5 cwt. potassium chloride per acre (as commercial muriate of potash, 60% K2O) and its chemical equivalent in sodium chloride: 1·8 cwt. per acre. Average response of sugar yield to sodium was higher than to potassium, especially in the wet summer of 1958. There was a negative interaction between sodium and potassium; in the presence of sodium it was uneconomic to apply potassium.
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S. N. Adams (1961) studied this question.
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