14c-Labelled Material Leached From the Rhizosphere of Plants Supplied with 14co2

Abstract

14C, supplied to plant tops as 14C02, was recovered in water-soluble organic material when pots with wheat, clover, or ryegrass growing in a podzolic sand were leached with distilled water at weekly intervals following exposure to 14C02. Similar material was recovered from unplanted controls. Percentage recoveries of total 14C supplied were ryegrass 0�41, clover 0,30, wheat 0,19, control 0�14. 14C was leached from all pots at a steady rate up to 10 weeks following cessation of exposure to 14C02.