E. J. Russell and E. H. Richards 



533 



Exft. 3. Effect of temperature on the aerobic decomposition of 

 large and small quantities of bullock dung. 



Large quantity (500 grams) 



Kept at 15° C. 

 Weight of wet manure, grnis. 

 Dry matter ... 

 Ammoniacal nitrogen 

 Amide nitrogen 

 Nitrous or nitric nitrogen ... 

 Other nitrogen 

 Total nitrogen 

 Ammoniacal nitrogen recovered 



in acid trap 



Nett loss of nitrogen ... 

 Kept at 26° C. 

 Weight of wet manure 

 Dry matter ... 



Ammoniacal nitrogen 



Amide nitrogen 



Nitrous or nitric nitrogen ... 



Other nitrogen 



Total nitrogen 



Ammoniacal nitrogen recovered 



in acid trap 



Nett loss of nitrogen ... 



* About 80 c.c. of water accidentally sucked back in this bottle. 



The percentage losses or gains of the ammoniacal, amide and other forms of nitrogen are 



expressed as percentages of the total nitrogen. 



Small quantity (5 grams) 

 Kept at 15° C. 

 Weight of wet manure, grnis 

 Dry matter ... 

 Total nitrogen at start, mgs. 

 ,, „ at end 



,, ,, lost ... 



Ammoniacal nitrogen recovered in acid trap 



Nett loss of nitrogen 



Kept at 26° C. 

 Weight of wet manure, grms. 

 Dry matter ... 

 Total nitrogen at start, mgs. 

 ,, „ at end 



„ „ lost ... 



Ammoniacal nitrogen recovered in acid trap 



Nett loss of nitrogen 7-7 = 20-0% 6-6 = 16-9% 



35—2 



