AGRICULTURAL EXPERIMENT STATION. 153 



also show that in order to obtain the greatest profit they must be 

 used with a knowledge of what the soil can furnish as well as the 

 requirements of the crop. 



In view of the fact, that in four out of five of these experi- 

 ments the increase in the crop was produced at least expense with 

 either potash, or phosphoric acid, or a combination of the two, il 

 would be well for the experimenters to continue their studies of 

 the effect of application of those materials in a rotation of crops 

 in which the clover has a place, relying on the clover to keep up 

 ihe nitrogen supply. In the fifth experiment, in which not only 

 the largest crop, but the crop in which the increase was produced 

 at least expense, came from a manuring with muriate of 

 potash and nitrate of soda, it would be advisable to try an experi- 

 ment to see if the clover in rotation could not be made to take 

 the place of the nitrate of soda. 



