150 



DESCRIPTION OF FEEDING STUFFS 



third, modern round silos. Silos of the first kind are still met with 

 in beet-growing districts, where the wet pulp from the beet-sugar 

 factories is cured or siloed in trenches near the factories, or in 

 shallow silos built up with board walls. Silos of the second type 

 are no more built or used, so far as is known. 



The first silo of the third type was built at Wisconsin Experi- 

 ment Station, in 1891, by the late Professor F. H. King, who 

 strongly urged the building of these silos in preference to other 

 silo types. This original round silo had a diameter of 16 feet and 

 was 27 feet high (capacity, about 90 tons of green corn). Since 

 the construction of this silo the tall, round silo has become well- 

 nigh universal in this country. While the materials used and the 

 dimensions have varied considerably, the principle of construction 

 of practically all silos built since the early part of the century has 

 been that first worked out and described by Professor King. 1 Mod- 

 ern silos are built a great deal taller than was previously the case, 

 the silos built during the last decade or two being 30 to 40 feet high 

 or more, with a diameter varying from 12 to 24 feet, according to 

 the capacity wanted. It is not recommended to build silos of larger 

 diameter than 20 feet, as it is difficult to feed out the silage from 

 such silos rapidly enough to prevent considerable loss through 

 decay of the surface layer, except in cases of very large herds. The 

 following table shows the relation between the size and capacity 

 of different silos of a diameter from 10 to 26 feet and a height of 

 20 to 40 feet: 



Approximate Capacity of Cylindrical Silos for Well-matured Corn Silage, 

 in Tons (King) 



Depth 

 of silo. 



Inside diameter of silo, feet 



1 Wisconsin Bulletin 28; Report 10, p. 201. 



