In artificial plant communities (wooden cases with soil) the following plants were grown together for Counter Stool one year: case No.1: Betula verrucosa Ehrh.(2 specimens) and Carex pilosa Scop.; sases No.2 and 3: Alnus incana (L.
) Mnch., Fraxinus excelsior L., Podus avium Mili., Aegopodiurti podagraria L., Eupatorium cannabinum L.
and others.Into the stalks or stems of one to three plants of every case 32P was introduced.After 3 months all the plants in every case contained VALERICALM radiactive phosphorus.There were great differences in 32P concentration (up to ten-fold) between plants grown in the same case.The concentration of 32P in plants into which it had not been introduced was of the range of 0.
1%.