22 HATCH EXPERIMENT STATION. [Jan. 



potash-magnesia. The yield of oats is in every instance 

 greater where the sulphate is used under otherwise similar 

 manuring. The superiority is most marked when sulphate 

 of ammonia is the source of niti'ogen. 



Muriate compared with Sulphate of Potash in con- 

 nection AviTH Sulphate of Ammonia for Corn. 



Results obtained with different crops in the special nitro- 

 gen tests on Field A during previous years having indicated 

 an injurious effect, due to the combination of muriate of 

 potash and sulphate of ammonia,* it was decided to under- 

 take experiments upon a larger scale, with the view of bring- 

 ing out more clearly the significance or importance of this 

 effect. Accordingly two plots of land of one-half acre each, 

 lying on the east side of the highway, were set apart for 

 this experiment. This land had previously been used in 

 experiments to determine the relative value of phosphatic 

 slag and ground bone as sources of phosphoric acid. These 

 experiments were begun in 1894 and continued until 1896. 

 The crops had been oats, corn and millet. An account of 

 these experiments will be found in the annual reports cover- 

 ing the years named. 



The following fertilizers were applied this year, broad- 

 cast, after ploughing, and harrowed in : — 



North plot: sulphate of ammonia, 152 pounds; muriate of 

 potash, 120 pounds; acid phosphate, 160 pounds. 



South plot: sulphate of ammonia, 152 pounds; sulphate of 

 potash, 120 pounds; acid phosphate, 160 pounds. 



The fertilizers were applied May 11. The crop was 

 planted in drills three and one-half feet apart. May 17. 

 The variety was Sibley's Pride of the North. 



The soil throuo'hout the season was too wet for the best 

 growth of the corn crop. The crop was harvested on Sep- 

 tember 6, and put into the silo. The yield was as follows : 



* For a full discussion of this subject see Dr. Goessmann's paper in the annual 

 report of the Hatch Experiment Station for 1897, pages 222 and 223. 



