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The influence of zinc, copper, cadmium, cobalt, and nickel on the absorption of calcium from solutions containing 0.5 mM Ca (NO3)2 by intact barley roots (Hordeum distichon L.) was studied in experiments lasting 2 and 24 h. Both absorption periods led to the following sequence of inhibition: Ni ≥ Co ≥ Cd ≥ Zn ≥ Cu, where copper showed an effect, which cannot be characterized as significant.
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