140 



MASS. EXPERIMENT STATION BULLETIN 212. 



Financial I nter'pr elation. 



No satisfactory financial interpretation of the results of the experiment 

 is possible. Fertilizers were applied according to a set schedule, without 

 reference to the value of the crop or to its ability to make payment through 

 increased acre value for the plant food applied. Neither was there any 

 attempt to estimate the necessity of one plant food or another as indicated 

 by the previous history of the plots, and response of the crops grown to 

 varying fertility treatments. 



The North Soil Test. 

 Hislory. 



This field was started in 1890. Previously it had been pasture, without 

 definite manure application, for a number of years. The plots are located 

 about 150 yards from the South Soil Test, and are on soil of the same 

 formation, although with a more definite slope toward the west. Fig. 3 

 shows the shape and arrangement of plots as compared with the South 

 Soil Test. 



Fertilizer Treatment. 



The fertilizer treatment was the same in principle as that on the South 

 Soil Test, except that the plots were differently laid out and hence bore 

 different numbers. The schedule follows : — • 



1 1892-95, 160 pounds per acre; 

 pounds per acre. 



increased to 400 pounds per acre; 1902, increased to 



