Rothamsted Symposium on Trace Elements 



72 



rendered. For further study, beans were grown in nutrient solu- 

 tions varying in MnS04 content. Symptoms identical with those 

 in the field could be induced by 25 or 37.5 mg/L (Plate Sh'). 

 Water colours, which I made, also show this very nicely. 





fid 



fifiM 



m 

 i ro 



'60 



5C 



59 

 U 

 It 



,u^ S 15 



M// S15 HSS lis *5 



10 5 



*St iff i.t 



60 5 d 10 15 5 

 tsf «w tit «*• i*s 



Textfigure 13.— Manganese content of foliage of ?haseolus vulgaris 

 CDubbele Prinsesseboon) and exchangeable manganese in the soil (1947). 



In my opinion, the deciding experiment was the one in which 

 beans were grown in glass dishes (Neubauer dishes) vwth soil 

 (400 g soil) from a toxic plot. Some of the dishes received 



