12 EXi'EULMEXT STATION. [Jan. 



an 1 west of the college [xtnd and the stream which runs into 

 it, high grade sulfate of potash is used at the rate of 150 

 pounds i)er acre. 



(3) On the balance of the area wiiicli lies south of the 

 Cross Walk and cast of the college i)oiid and stream, the ])<)tasli 

 salt used is the low grade sulfate at the rate of oOO jjounds per 

 acre. 



With each of these dill'ering coinliiniit ions we are applying 

 nitrate of soda on about one-half of the total area to three 

 substantially equal jdots. The rates res})ectively are 150, 200 

 and 250 pounds per acre. 



Owing to the large area covei'cd by these experiments, and 

 the N'arying conditions as to weather, often showery, in which 

 hay must be handled, it has been found difficult to obtain 

 weights which are strictly comparable. The general results 

 have, however, l)een clearly a])parent, and the following figures, 

 based np<»n sucdi weights as luive been taken during the past 

 three years, in a measure indicate what the}' have been. 



1. Slag jMkal axd Muktate of Potash both with and 

 WITHOUT Nitrate of Soda. 



Tn the section of the field where these fertilizers have been 

 used, the yields on the plots to Avhich no fertilizer has been ap- 

 plied have varied between 807 and 1,838 pounds per acre. The 

 average for the i)ast three years has been 1,419 pounds ]-»er acre. 



Top-dressing Avith slag meal and muriate of ])otash produced 

 an increase in crop which has varied during the past three years 

 from 1.588 to 1.002 pounds per acre. The average increase has 

 been jit tlie rate of 1.71 1 jioiukIs ])er acre. The total crop ])ro- 

 dnced where slag meal and muriate of ])otash have been a]ip1ied 

 as to|i-di-essing has averaged 3.133 pounds per acre. 



The gain resulting froui top-dressing with nitrate of soda at 

 the rate of 150 pounds ])er acre in connectiou with the slag and 

 muriate of ]>otash has varied between 557 and 1.205 jiounds 

 per acre. 



The use of 200 pounds of nitrate of soda ]^ov acre has pro- 

 duced an increase varying from 543 to 2.775 ]iounds, the aver- 

 age for the ])iist thi-ee years being 1,410 pounds per acre. 



The use of 250 ]-ounds of nitrate of soda ])cr acre in connec- 



