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Measurements were made of the uptake of ammonium and nitrate by successive zones of the radicle of intact seedlings of Pisum sativum L. A modified version of the potometer designed by Gregory and Woodford (1939) was used to supply separate zones, and the amounts of nitrogen absorbed were determined with the stable isotope lON.

The Uptake of Nitrate and Ammonium by Suceessive Zones of the Pea Radicle