42 



EXPEKIMENT STATION. 



[Jan. 



less, on the combination of materials representing the spe- 

 cial corn fertilizer. The crops of corn stover and of rowen 

 have been greater on the combination of materials furnish- 

 ino- more potash. This is in accordance with what is to be 

 expected, as the potash is found almost invariably to favor 

 a large proportion of clover in mixed mowings, and as it has 

 been shown in the resnlts of many experiments in this State 

 that stover is increased in larger proportion through appli- 

 cation of potash than is the grain. ^ 



At the prices which have prevailed during the period of 

 the experiment, the cost per acre of the fertilizers used on 

 plots 2 and 4 has averaged about $5 less than the cost of the 

 materials used on plots 1 and 3. Taking the crops as a 

 whole, thej have been substantially equal under the two 

 systems of fertilizing ; and the advantage, therefore, is clearly 

 with the fertilizer combination richer in potash, unless it 

 can be shown that the condition of the soil upon plots 2 and 

 4 is now inferior to that of the soil on plots 1 and 3. Such 

 inferiority is not indicated by the present relative yields. 

 Neither does a study of the income and outgo from the soil 

 of fertilizer elements upon the several plots point in that 

 direction. Calculations made at the close of 1905 to de- 

 termine the fertilizer ingredients supplied and removed from 

 the several plots gave the following results : — 



A study of the figures of the above table indicates that 

 on every plot a much larger quantity of nitrogen has been 

 removed from the soil than has been supplied in the fer- 



tilizers used. 



Tlie large excess of nitrogen removed can be 



1 Bulletin No. 9 and Bulletin Xo. 14, Hatch Experiment Station. 



