FORMATION OF PROTEIDS ETC. 

 IN loo PARTS OF DRY MATTER :— 



497 





Control plants dried 

 on 1 2th 



Plants kept in dark 

 dried on i8th 





3-92 

 o.iS 



4.11 

 0.14 



IN lOo PARTS OF TOTAL NITROGEN. 





Control plants dried 

 on 1 2th 



Plants kept in dark 

 dried on 1 8th 



Nitrates nitrogen 



loo.o 

 4.6 



100.0 

 3.6 



A little decrease of nitrogen in the plants kept in the dark was 

 observed here, but as the sugar solution applied was too dilute, the 

 reduction proceeded rather slowly. 



(b) The same experiment was repeated with the same potato 

 plants. 



Time of experiment May 13-18. 

 Temperature Min. 8°C. Max. I5°C. 



IN 100 PARTS OF DRY MATTER. 





Control plants dried 

 on 13th 



Plants in dark dried 

 on 1 8th 



Total nitrogen 



Nitrates nitrogen 



4-97 

 0.54 



5-05 

 0.42 



IN 100 PARTS OF TOTAL NITROGEN. 





Control plants dried 

 on 13th 



Plants in dark dried 

 on 1 8th 



Total nitrogen 



Nitrates nitrogen 



100.0 

 10.9 



100.0 

 8.3 



