An intaet plant, was arranged so Lhat Llle top and rools W"t'O sealod in sopamto flasks. In oaeh flask tho vapour pressllre was mainta.ittod at a prodotormined len,1 so thai, a diffusion gradieni". favouring wat"r mo\'omont "iCher 1'1'0111 roots to tOJl or from top to roots was established.
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R. O. Slatyer (1956) studied this question.
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