Fig. 15. A fertilizer containing borax was applied to the left-hand 

 portion of this field. The stake in the row at the center marks the point 

 where the owner changed to a fertilizer of the same formula, but con- 

 taining no borax. 



Fig. 16. A 3-6-6 fertilizer, with a smaller amount of 5-10-0 applied 

 later, was used on the two and a fraction rows beginning with the point 

 marked with the hat and ending at the point where the stake is placed. 

 The potatoes on either side were fertilized with 5-10-0 alone. See p. 102. 



