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The effect of potassium concentration in the nutrient medium on growth and mineral composition (N, K, P, Ca, Mg, Na) of red beet, cabbage, lettuce and Italian ryegrass in sand culture was investigated. It was shown that the results and those of some earlier workers can be interpreted as a simple linear relationship by means of the equation: where y is plant weight or leaf potassium content, x is potassium concentration in the nutrient medium and a, b and x0 are constants. Sand‐grown plants contained relatively high concentrations of sodium, which played an important part in the maintenance of cation balance under these conditions. In red beet, cabbage and ryegrass, changes in potassium content were almost completely balanced by corresponding changes in sodium content with relative constancy of calcium and magnesium, whereas in lettuce, calcium and magnesium also functioned in maintaining the balance.
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G. G. Freeman (1967) studied this question.
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