64 INDIAN CORN CULTURE. 



At the Greorgia station nitrogen experimeiits 

 were conducted upon 25 plats of 3-40th acre 

 each. In general the results indicated that 

 "nitrogenous manure increased the yield of 

 corn covered by the experiments; that nitrogen 

 alone, regardless of the source, was more effec- 

 tive in increasing the yield of corn than either 

 phosphoric acid or potash, or both combined; 

 but that when a large amount of fertilizer 

 was to be applied to corn it was best to add all 

 three of the elements."* In the general ferti- 

 lizer experiments of this station in 1893 nitro- 

 gen was the most effective fertilizer used, and 

 it was concluded that at present prices of com- 

 mercial fertilizers they could not be used with 

 profit.! 



At the Ohio station in 1890 and 1891 some 

 increase has followed the use of nitrogen in 

 every case, but in 1888 there is no evidence 

 that nitrogen, whether used alone or in com- 

 bination with phosphoric acid, has produced 

 any increase in crop beyond the limits of prob- 

 able variation in the soil itself. "Experiments 

 were conducted on five private farms in five 

 counties, in which it was shown that (1) nitrate 

 of soda in combination with dissolved bone- 

 black or muriate of potash, one or both, has 



* Georgia agricultural experiment station, Bulletin 15, 

 December, 1891. 



t Georgia station, Bulletin 23, December, 1893. 



