140 MASS. EXPERIMENT STATION BULLETIN 212. 



Financial Interpretation. 



No satisfactory financial interpretation of the results of the experiment 

 is possible. Fertilizers were applied according to a set schedule, •uithout 

 reference to the value of the crop or to its abihty to make pajonent 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 growTi to 

 varying fertility treatments. 



The North Soil Test. 

 Histonj. 



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

 definite manure application, for a number of j^ears. 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: — • 



Plot. 



Treatment. 



Pounds 

 per Acre. 



No fertilizer. 

 Nitrate of soda . 

 Dissolved boneblack 

 No fertilizer. 

 Miiriate of potash 



Nitrate of soda . 

 Dissolved boneblack 



Nitrate of soda . 

 Muriate of potash 



No fertilizer. 



Dissolved boneblack 

 Muriate of potash 



Nitrate of soda . 

 Dissolved boneblack 

 Muriate of potash 



Plaster 



No fertilizer. 



160 

 320 



160 



160 

 320 



160 

 160 



320 

 160 



160 

 320 

 160 



800 » 



1 1892-95, 160 pounds per acre; 1896, increased to 400 pounds per acre; 1902, increased to 

 800 pounds per acre. 



