MANURE, YIELD AND SOLUBLE SALTS IX SOILS. 7 



On this basis of comparison the 15-tons of manure have 

 about doubled the gain over the 5-tons per acre, and the 300- 

 Ibs. of guano have only made a little more than half the gain 

 the 5-tons of manure per acre made, as an average, on each 

 group of soils. 



When the corn was husked, after drying in the shock, a com- 

 posite sample of the ears was taken for each fertilization, at 

 the time the corn was weighed, and the water-free shelled corn 

 computed from the per cents, of dry matter and of shelled 

 corn found. These results are given in the next table. 



Yields of water-free shelled corn, from 8 soil typw under 5 fertiliza- 

 tions. 



It is here seen that, on the four poorer soils, there is a sys- 

 tematic difference in yield of water-free shelled corn which is 

 closely related to the fertilizers applied to the soil. The group 

 of four stronger soils do not show, throughout, this systematic 

 relation. The reason for the departure, in the H|agerstown 

 Loam, has been stated. There is this to be said regarding' the 

 Janesville Loam; the area chosen is part of a well managed 

 dairy farm where the fields are held well up to their maximum 

 limits of productiveness so far as plant food is concerned. 

 Moreover, it was observed, as the corn was coming into full tas- 

 sel, that in the outside row of hills next to the fallow area, 

 throughout the entire 440 feet, the corn was very materially 



