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.