12 FARM AND SCHOOL PROBLEMS. 



manure produced in one year by a 150-pound pig fed on a highly 

 nitrogenous food to be $3.34, and that of a pig of similar weight 

 fed on a carbonaceous ration to be $1.84 for the same period. 



The composition and value of mixed fresh manures accord- 

 ing to Roberts is as follows: 



Water, 75.9; Nitrogen, 0.45; Phosphoric Acid, 0.21 ; Potash, 

 0.52 per cent. 



The value of this mixed manure at 15 cents per pound for 

 nitrogen, 5 cents for phosphoric acid and potash is $2.08 per ton. 



From the foregoing tables it may be estimated that live stock 

 with the exception of poultry, sheep and hogs, will under ordinary 

 conditions produce certain results from which we are able to 

 reach the following conclusions : 



1 . 1,000 pounds of live stock on the average farm will produce 

 about 12 tons of manure per year. 



2. The value of this manure if well cared for, is worth at least 

 $30 per year. 



3. The total value of a manure is dependent upon the quality and 

 qauntity of feed and bedding used. 



4. To determine the value of manure, the farmer must calculate 

 what the nitrogen, phosphoric acid, and potash in the manure 

 would cost if purchased as commercial fertilizers. 



5. In general it is safe to estimate that 75 per cent of the fertility 

 in the feed is in the manure. 



7. The fertilizer value as given in these tables depends upon the 

 immediate use or the chemical treatment of these manures to 

 prevent fermentation or leaching. 



PROBLEMS. 



1. It has been estimated at the price that plant food in manure 

 would cost in fertilizers, that we are producing annually in the United 

 States, manures worth as fertilizers $2,353,000,000. If 60 per cent of 

 our manure is wasted what is the loss to the farmers of the United 

 States? 



'2. If 40 per cent of all losses such as leaching and liquids could 

 be prevented, what would be the gain in value of fertilizers annually? 



3. If on an average we can save 90 per cent of the fertility in 

 feed given to fattening cattle, how much can we save in value of fertil- 

 izers in feeding 8 ton of alfalfa? 100 bushels of corn? 2 ton of timothy 

 hay? 50 bushels of oats? (See table page 7). 



4. If a horse weighing 1,000 pounds consumes 2 pounds of cotton- 

 seed meal, 6 pounds of shelled corn, 6 pounds of wheat bran, and 13 



