56 AGRICULTURE 



pasturage. This, has been found to pay because of the 

 increased supply of milk produced. 



Size of the silo. The size of the silo must depend on 

 the number of the herd to be fed from it. Silage exposed 

 to the air decays rapidly, especially in warm weather. In 

 order to ayoid waste it is necessary to feed from one and 

 one-half to two inches daily from the surface of the silage. 

 If the herd is small or the silo too great in diameter, this is 

 impossible. 



Owing to the closer packing, silage is better in quality 

 as the depth increases. It is therefore better to build a 

 silo of considerable height rather than low and of greater 

 diameter. Moderate-sized silos are built from thirty to 

 forty feet deep. Silos are now being constructed with a 

 water-tank in the top into which water for house and barn 

 use is pumped by a windmill. This gives the necessary 

 pressure without the cost of building a tower for the tank. 



The following table shows the size of silos required for 

 herds of different sizes (allows each cow forty pounds a 

 day for one hundred eighty days) : 



Number of Estimated Capacity Silo Diameter Silo Height 



Cows in Tons in Feet in Feet 



7 26 10 20 



14 51 10 32 



21 73 12 32 



27 101 14 32 



33 119 16 30 



43 155 16 36 



54 196 18 36 



An average acre of corn will yield from eight to twelve 

 tons of silage. Hence, knowing the capacity of the silo in 

 tons, it is easy to compute the acreage of corn required to 

 fill it. 



Harvesting by "hogging down." Under certain con- 

 ditions corn may be profitably harvested by "hogging down." 



