Fig. 1. A. Phaseolus vulgaris in the same pots with Equisetum hyemale, E. 

 arvense and E. fluviatile, to determine the time of wilting. B. Helianthus annua* 

 in the same pots with Equisetum hyemale, E. arvense, and E. fluviatile, to de- 

 termine the time of wilting. 



9 



