GROWTH RESPONSE OF CABBAGE PLANTS TO LITHIUM, SODIUM, AND RUBIDIUM UNDER WATER CULTURE CONDITIONS

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Cabbage(B. oleracea L. var. capitata L.) plants were grown for 79 days in culture solutions containing 4 levels of lithium(0,0.1,1,10 me/l), sodium(0,0.2,2,20), or rubidium(0,0.05,0.5,5)combined with a low or high supply of potassium(0.2 or 2 me/l), and the effects of the cations supplied on the growth and cation composition of the plants were studied. The total dry weight of the plants decreased at higher levels of the cations, especially Li in the culture solution, concurrent with an increase in the contents of each cation in the plants. The decrease in the dry weight at higher levels was smaller in the high K supply, than in the low K supply causing a decrease in the contents of the cations. The critical contents of Li, Na, and Rb which resulted in a 50% decrease in the dry weight of inner leaves due to excess injury were estimated to be about 0.07,2.5,and 3.0% on a dry basis in the outer leaves and 0.05,2.0,and 3.0% in the roots, respectively, regardless of the K supply.
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