(516 Report of thb Department of Field Crops. 



The Ftilization of Plant Food. 



It has been noticed in some cases tJiat the percentages of cer- 

 tain plant food compounds taJjen up by a crop are increased by 

 libemJ manuring. Tliis does not seem to be the case in these 

 experiments as the figures in Table IX clearly show. Neither 

 the kind nor the amount of fertilizer applied caused noticeable 

 variation in the percentages of nitrogen, phosphoric acid and 

 potash found in the tubers. 



