Abstract
The effect of the strontium/calcium ratio of the nutrient solution was studied under controlled conditions in Pisum sativum. The nutrient solutions varied in their Sr/Ca ratio whereas the sum total of strontium and calcium was maintained at 5 m-eqiv./l. Translocation rates, concentration factors as well as the chemical forms of strontium and calcium were studied. The results indicate a different distribution of strontium and of calcium in the shoot and in the roots depending upon the Sr/Ca ratio of the nutrient solution. For a very low ratio (as occurs in soil, taking into account the greater retention of strontium than of calcium by the substrate and the amounts generally present) the calcium content of the shoot increases more rapidly than that of strontium. In this case the concentration factor for strontium is greater in the roots than in the shoot. When the Sr/Ca ratio increases the reverse is eventually obtained. A low Sr/Ca ratio results also in a different chemical distribution of these elements. The lower the concentration of strontium in the nutrient solution the greater is the fraction soluble in HCl 2 N. The distributions of calcium and strontium are clearly different for a lower Sr/Ca ratio.
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