Food for 

 Plants 



228 



FERTILIZERS. 



Contributed by J. L. Hills, Vermont Experiment Station. 



Average cost of a pound of plant food in low, medium 

 and high grade (Vermont, 1903.) 



Mtrogen 



^ra^ 



Available 



Fhosphoric 



Acid 



L?,.i.) - 



i-i-i , '■■I.J- 



Fotash 



LOW GRADE 

 MEDIUM " 

 HIGH 



