4 FARM ARITHMETIC. 



Solution : 

 45% of 2,000 pounds = .45 X 2,000 pounds = 900 pounds. 



Answer : GOO pounds carbon. 



Note. — The above solution may be made as follows : 



1% of 2,000 pounds = 20 pounds. 

 45% of 2,000 pounds = 45 X 20 pounds = 900 pounds. 



Solution for the remaining constituents : 



2,000 X .42 =840 Oxygen 



2,000 X 065 = 130 Hydrogen 



2,000 X .015 = 30 Nitrogen 



2,000 X 05 = 100 Mineral 



900 Carbon 



Total 2,000 



This addition serves to check or prove the correctness of the 



work. 



2. How many pounds in each ton are obtained from ' 

 the soil ? From the air and water ? 



Wheat contains : 



Carbon Oxygen Hydrogen Nitrogen Ash 



In grain 46.1 43.4 5.8 2.3 2.4 



In straw 48.4 38.9 5.3 0.6 7.0 



Note. — The percentages given in the preceding table, as well 

 as in those to follow, are merely average values. The corre- 

 sponding percentages for any given sample may differ greatly 

 from these figures. For example, two varieties of corn grown 

 in the same soil and under the same climatic conditions may have 

 greatly different chemical analyses. This may also be true of 

 two samples of the same variety grown under different climatic 

 conditions or in different soils. 



3. In producing a ton of wheat, how many pounds 

 come from the soil? A ton of wheat straw? 



4. How many pounds of carbon in 25 bushels (60 

 pounds each) of wheat? 



5. When wheat yields 25 bushels of dry grain an acre 



