1898.] 



PUBLIC DOCUMENT — No. 33. 



21 



Nitrogen Experiment. 



Calculation shows that the average total weight of crop is 

 a little less than one-half as great on the plots not manured 

 with nitrogen as the average of the other plots. The crop 

 of grain is a little more than one-half as great. We find, 

 then, not the least evidence of any ability on the part of the 

 so3'^a bean when grown before a grain crop (and harvested) 

 to make nitrogen manuring of the grain crop unnecessary. 

 On the contrary, the proportional yield of the no-nitrogen 

 plots is this year the lowest it has ever been in these experi- 

 ments. 



TJie Relative Value of the Different Manures furnishing 



Nitrogen. 

 The nitrate of soda gives the largest crop. Next in order 

 of yield come the barn-yard manure, dried blood and sul- 

 phate of ammonia ; but between these there is not much 

 difference. On plots 2, 3, 4, 6, 7, 8 and 9 the source of 

 potash is the muriate ; on all others it is double sulphate of 



