530 



The Storarje of Farmyard Manure 



It will be seen that these changes are precisely similar to those 

 observed in the laboratory investigations on protein, and in the anaerobic 

 decomposition of sewage. The apparent discrepancy between these 

 and the manure heap is therefore not due to any peculiarity of the 

 manure, but arises solely from the conditions of storage in the heap. 



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Fig. 8. Changes in nitrogen compounds in farmyard manure (bullock manure) stored 

 in the laboratory under aerobic conditions at different temperatures. 



Aerobic storage. The results obtained under aerobic storage are 

 given in Table V, and set out in Fig. 8. There is no appreciable gain in 

 ammonia, in one case there is an actual loss. But a new feature appears 

 in these experiments : the nitrogen at the end is no longer equal to that 

 at the beginning, but is notably less: there has been, therefore, a loss 

 of nitrogen. This shows that some change goes on here which did not 

 occur under anaerobic conditions. The aggregate amount of complex 

 nitrogen compounds broken down increases when air is admitted : 

 it is possible that the whole is converted into ammonia, and if so there 



