Studies of the growth and mineral nutrition of barley varieties. I. Effect of potassium supply on the uptake of potassium and growth

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Abstract
The effects of [K+] (in 1 to 100 μM range) upon uptake, accumulation, and utilization of K+ and upon absolute and relative growth rates were studied in 27 barley varieties. An external concentration of 1 μM was inadequate for growth and severe deficiency symptoms were observed. Above 5 μM no deficiency symptoms were apparent; however, there were substantial intervarietal differences in their responses to varying [K+]. Four varieties were studied in greater detail. At low [K+], the varieties with higher absolute and relative growth rates also had higher K+ uptake rates, higher root weight ratios, and higher efficiencies of K+ utilization.
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