252 Irrigation and Drainage 



As an example of the amount and kind of material 

 which would be added to the land where what is re- 

 garded as exceptionally pure water is used, we com- 

 pute from the results of analyses of the water of the 

 Delaware river* the amount of material contained in 

 solution in 24 acre -inches, as follows: 



Materials in 24 acre-inches of Delatvare river rvater 



Pounds 



Calcium carbonate 242.6 



Magnesium carbonate 166.16 



Potassium carbonate 31.74 



Sodium chloride 20.54 



Potassium chloride 1 .86 



Calcium sulphate 35.48 



Calcium phosphate 26.14 



Silica 93.34 



Ferric oxide 56 



Organic matter containing ammonia .... 117.62 



Total 741.08 



The average amounts of nitrogen compounds, as 

 computed from the chemical analyses of the waters of 

 twelve streams in New Jersey, are as follows : 



Nitrogen Compounds dissolved in 24 acre-inches of water from 12 



streams in New Jersey 



Pounds 



Free ammonia 15.63 



Albuminoid ammonia 81.12 



Nitrates 772.67 



Nitrites . .86 



Total . . 870.28 



*Rept. New Jersey Geol. Survey 1868, p. 102. 



