RESIDUES LEFT BY MANri;i> 



•J(i.> 



luanure. We thus obtain a iiR'ans of asccrtainiiii: uliat loidue 

 is left in the land after the removal of the crop to wliicli the 

 manure lias been applied. If, for example, we compair tin* 

 plots receiving minerals only with those receivinu^ nniH'i-;iI> and 

 nitrogen, on the fallow portion the additicm of nitmgcn [(nMhucs 

 an increase of crop from 188 to 44^^ cwt. jxm- acrr, nr of i:js 

 per cent. This crop of roots is entirely removiMl. but tlic suc- 

 ceeding barley crop shows a total produce of 'J.')?.') 11 >. on thr 

 plot where nitrogen was apphed to the roots, against Is-J.') II,. 

 on the plot without nitrogen ; thus the residue of the nitrogen 

 in the gromid after one crop had been grown and nMuovcfj was 

 still able to increase the next crop l)y 41 per cent. 



The following Table (LXX.) shows the sununariscd icsuhs 



Taule LXX. — Crops groioi in rotdJion, AgdcU Field. Ti>l(tl prodmr jicr 

 acre. Mean of five Courses, 1884-1903. Increase due to Nit roijcnovs 

 Manures applied to the Swede Crop only, and their Residues. 



for the last five courses on both the fallow and tli.- clovi'i- 

 portions. 



It will be seen that a nitrogenous dressing consisting of 

 rape cake and aminonium-.salts leaves in the groumi. after 



