64 INDIAN CORN CULTURE. 
At the Georgia station nitrogen experiments 
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- 
hzer 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. “Kxperiments 
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 16, 
December, 1891. 
} Georgia station, Bulletin 23, December, 1893. 
