RECOVl'i:\' oi" MTi:()(ii;\ I\ CL'ol 



1 i:: 



supplied i It Mdiiurc. In view ot tlic l.ir^.' aiiKuiiits <.t nitrogen 

 applied in the nianurt's, ii is important to consider what 

 proportion of I'arh of tlie dilVcrent nitrogenous conijxiund.N 

 is recovered in the crop. 



If the soil has sutfered no loss of nitrogen, then the whoir 

 of the nitrogen removed in the crop must have heen di-rived 



T.vr.LE XLII. — Man(/el Wurzel. Rrlation hdvccn the yitroi/en roovcral 

 ill Crop and that supplied in Manure. 



» Average for 21 years, omitting 187i)-7, 1885, 1895, 11*01-2. 

 \ Average for 22 years, omitting 187(3-7, 1885, lttOl-2. 

 X Percentage calculated from 9 years, 1878-82, 18!>7-1900. 



from the manure, and on that assumption the percentages given 

 in the following table are calculated. In calculating the 

 amount of nitrogen recovered each year no acctnint has ]>een 

 taken of the leaves, because they are returned to the soil and 

 their nitrogen i.s not removed from the land ; if both leaf and 

 root were taken into account the recovery of iiiticLit'n tor any 

 single year would be very much greater; indeed in some 

 seasons when a big crop is grown more nitrogen is removeil in 



