520 



The Storage of Farmyard Manure 



where, therefore, the manure collected during winter is more than is 

 wanted for the roots. 



How far can the losses go? Reference to the tables, and still more easily 

 to the figs, show that in general the loss of nitrogen compounds is rapid 

 at first, and falls off afterwards. Thus, in the cow manure (Fig. 6) the 

 nitrogen as ammonia rapidly falls from 19 to 4, then to 1, while the more 



iV/T/fOGf/V 



/o 



p 



it 



AtSta/^t 



Fig. 5. Changes in nitrogen compounds in farmyard manure (horse manure) 

 in the open in loose heaps. 



complex compounds fall from 73 to 65, then to 57, and finally after 

 nine months to 55 : the amides on the other hand remained practically 

 constant. The total nitrogen at the end was only 62 % of the quantity 

 originally present, making a loss of 38 %. In the bullock dung left 

 for the same period the losses are finally greater, the total nitrogen 

 falling 50 %. 



