Potassium uptake efficiency of potato and wheat in relation to growth in flowing solution culture
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Uptake efficiency (in terms of shoot K content) of potato decreased with time compared to that of wheat at a deficient K level of 1.5 μM. This resulted from the decrease in root-shoot ratio with time for potato only. Both shoot and root growth rates of potato depended on solution K levels in the initial stages and were greater at higher K levels. At optimum K, uptake efficiency of potato increased with time and this was due to the increased K-influx with time. The K concentration of 4–5% in the potato shoot was sufficient to achieve 90% of maximum shoot growth rate. Plants grown at optimum K concentration attained shoot K content of 4–5% rapidly and achieved maximum shoot growth rate faster than those grown at low K concentration.
Additional keywordsK-influx ratio root-shoot
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