VII.] COMPOSITION OF FARMYARD MANURE 203 



weight of water, about two-thirds of i per cent, of 

 nitrogen, one-quarter of i per cent, of phosphoric acid, 

 and one-third of 1 per cent, of potash, or per ton about 

 1 5 lb. of nitrogen, 5 lb. of phosphoric acid, and 7 lb. 

 of potash. The composition, however, will vary very 

 greatly, both with the nature and feeding of the animals, 

 and the treatment and storage the manure receives. 



The influence of the feeding is well illustrated in 

 a series of analyses of two lots of dung, made in 



Table L IX. —Percentage Composition of Farmyard Manure 



MADE at RoTHAMSTED FROM ROOTS AND HaY ONLY, OR 



FROM Roots and Hay with Cake. 



Roots and Hay 



only . 

 Cake-fed 



Roots and Hay 



only . 

 Cake-fed 



Roots and Hay 



only . 

 Cake- fed 



Roots and H: 



only . 

 Cake-fed 



1904 

 1904 



1905 

 1905 



1906 

 1906 



1907 

 1907 



Made into 



Mixenand 



stored. 



Do, 



Do. 



f Not 

 j stored. 



adjoining boxes by bullocks receiving in the one case 

 roots and hay only, and in the other a fattening ration 

 of cake in addition to the roots and hay. The two lots 

 of dung were generally made up into separate mixens 

 out of doors, and sampled a month or two later, when 

 they were carted out to the land ; in one case they 

 were sampled as they left the boxes. Table LIX. 

 shows the analytical results, not only as regards the 



