1897.] PUBLIC DOCUMENT — No. 33. 223 



tion upon each other than on the general character and the 

 particular chemical composition of the soil which receives 

 them. The results of the chemical reactions between the 

 saline constituents of the fertilizers and of the soil are as apt 

 to benefit the crop as to injure it ; the above-described ob- 

 servation furnishes an illustration of an injurious influence. 

 Sulphate of ammonium is evidently a safer source of nitrogen 

 for plant growth when used in connection with sulphate of 

 potash than when used with umriate of potash (chloride of 

 potassium) . 



