Abstract
Potassium fertilizer experiments with spinach were carried out under 2 levels of soil moisture content to clarify the role of K in osmotic adjustment and the effect of moderate water stress on the critical K concentration of the youngest leaf.As soil moisture content decreased from pF 2 to pF 2.7, predawn leaf water potentials decreased slightly, and osmolality of the expressed sap increased by about 55 mosmol regardless of rates of K applied. The increase of about 45 mosmol in osmolality was realized by the accumulation of K and Na with their balancing anions, although the relative contribution of K varied with K supply.The critical K concentration of the youngest leaf, expressed in % cell sap, was constant at 0.74% at both pF 2 and pF 2.7.
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