38 



29 



30 



31 



32 



33 



34 



35 



36 



37 



3« 



Chinone 



CJf 



/ 



O 





C6H4 



C) 



Cinuamic acid 



Sodium rinnamate 



Colls • CU : CH • COONa 



Cumarin 



yCH : CH . CO 



\o 



T)a|iliiU'Lin 



x:ii : Cll-CO 

 CoH.^O 



C,.slT. .0, 



Piponmal (Hrliniropin) 



XilO 



SkiUol 



C • CTT, 



\ i 



Rum 

 Miuiu ' 



*,)uiiut: acid 



C(.U,(f>IU4-CO(^I! 



9 



8 



12 



8 



12 



13 



7 



10 



TO 



10 



100 ppm 



I ppm 



100 ppm 



100 j)pm 



• 4 « ■ * * 



500 ppm 



100 pp n 



200 p])m 



25 ppm 



100 l>pm 



T ppm 



SO ppm 



I ppm 



I ppm 



50 ppm 



' * 



500 ppm 



40 ppm 

 too ppm 



100 ppm 



^ t 



Roots were slimuhitcd in lower 

 concentralions. 



Insoluble above 50 p[)m. -Roots 

 injured marc than tO[)s by 50 

 j)pm. 



Roots injnrfd more (lian lops. 



InMjlublc above 50 ppm. 



Not tested in soluiioiis slrongcr 

 than TOO ppm on aieounl of 

 insolubility. 



o 

 a 





O 



2 





