WEARING OUT THE SOIL 47 



Table VI. 

 Table showing fertilizing substances in dairy products: 



OUNCES PER IOO POUNDS. 



Phosphoric 

 Nitrogen. Acid. Potash. 



Cheese 63 oz. 10 oz. 2 oz. 



Milk 8 oz. 3 oz. 3 oz. 



Butter 2 oz. 3-5 oz. y 2 oz. 



Table VII. 

 Table showing fertilizing substances in farm animals: 



OUNCES PER IOO POUNDS. 



Phosphoric 



Nitrogen. Acid. Potash. 



Cattle 40 oz. 29 oz. 3 oz. 



Sheep 35 oz. 19 oz. 3 oz. 



Hogs 32 oz. 130 oz. 2^2 oz. 



Problems. 



1. How much nitrogen is sold from the farm with 

 every ton of butter? How much phosphoric acid? 

 How much potash ? 



2. How many pounds of these three substances 

 are sold with every ton of cheese ? 



3. How many pounds of each are sold with 100 

 Ibs. of butter? With 100 Ibs. of cheese? Which is 

 harder on the soil? 



4. How much of each of these fertilizing sub- 

 stances in a 300 Ib. pig ? 



5. How much of each of these fertilizing sub- 

 stances in a 1,200 Ib. steer? 



6. A farmer sells 20 hogs, each weighing 225 Ibs. 



