318 AGRICULTURE 



the manure produced during the seven winter months on a 

 farm keeping four horses, twenty cows, fifty sheep and ten 

 hogs would be at least two hundred and fifty dollars. These 

 figures are based on the cost of an equal amount of com- 

 mercial fertilizer. 



It is true that not all the fertility taken from the soil by 

 farm crops can be returned by using the manure from the 

 feeding of crops, but the greater part of it can. The 

 manurial value of different farm products, based on the 

 cost of commercial fertilizers, is shown in the following 

 tables: (Farmers' Bulletin 193, United States Department 

 of Agriculture.) 



Value as fertilizer in one ton of farm products. 



We see from this table that the farmer who sells 

 a ton of meadow hay loses from his farm fertilizer value 

 that would cost about five dollars if purchased in commer- 

 cial form. If he sells clover hay, he loses almost as much 

 value in fertilizer as his hay brings him. If he pays twenty 

 dollars a ton for wheat bran he gets over thirteen dollars' 

 worth of fertilizer, leaving the feeding cost about seven 

 dollars. 



Of course it is evident that these values will not be ob- 

 tained from the feeding of farm crops unless the manure 



