I903J 



Farmyard Manure. 



Table XII. — Produce of Hay per acre, First and Second 

 Crops, showing Residual Effect of Dung. 







Years, S 









Average of — 









































en 



"<*■ 



MD 

 00 





in 









ir lot. 



.Manures. 



00 00 



M 



c/Too 



.rs, 

 188 



wio* 



rs, 

 190 







1 



Season 



a 



0 



3 7 



^ vO 



>S 



Co 1 

 £^ 



3 7 



TO 1 



Si 







<v 00 



ai 



<u 



00 

 0 „ 



2 ~ 



0? 



o-°9 







Lb. 



Lb. . 



Lb. 



Lb. 



Lb. 



Lb. 



Lb. 



2 



years (1856-1863) 



































Unmanured since 



4,804 



5,392 



2,848 



3,726 



3,748 



2,791 



i,943 



3 



Unmanured continu- 



















ously ... 



2,665 



2,688 



1,296 



2,374 



3,025 



2,621 



1,686 





Relation to produce of 



















plot 3 reckoned as 



















100 — 

















2 



Farmyard manure, 8 

 years (1856-1863) 



































Unmanured since 



180 



201 



220 



157 



124 



106 





3 



Unmanured continu- 



















ously ... 



TOO 



100 



100 



100 



100 



100 



100 



A similar experiment was made on the barley plots, one 

 of which received 14 tons per acre of farmyard manure for 

 20 years from 1852 to 1871, and has since been left unmanured. 

 Table XIII shows the yield from this plot, from the unmanured 

 plot, and from the plot which has continued to receive 14 tons 

 of farmyard manure every year, for the years immediately 

 following the discontinuance of the dung and for successive 

 five yeax periods since. It will be seen that though the yield 

 has fallen continuously to about 40 per cent, of that of the 

 continuously dunged plot, it still remains more than double 

 that of the wholly unmanured plot. 



In considering the results of these last two experiments it 

 must be remembered that such a long duration of the residues 

 of farmyard manure would not be perceptible in practice ; 

 they only become apparent when the soils are cropped to a 

 state of exhaustion that would never be met with in ordinary 

 farming experience. 



Since only a portion, and that not the largest, of the nitrogen 

 of farmyard manure is readily available, if it is the only manure 

 supplied a crop in a good season is often unable to obtain its 

 nitrogen rapidly enough, even though very large quantities 

 are lying dormant in the soil. As an example we may take 



