334  Nitrogen  as  Nitric  Acid,  in  the  Soils 
of  the  soil.  In  the  first  division  the  turnips  are  manured  with 
200  lbs.  of  ammonium-salts  (equal  parts  sulphate  and  chloride), 
2000  lbs.  rape-cake,  3J  cwts.  superphosphate  (200  lbs.  bone-ash 
and  acid),  300  lbs.  sulphate  of  potassium,  200  lbs.  sulphate  of 
sodium,  and  100  lbs.  sulphate  of  magnesium.  The  turnips  are 
fed  on  the  land,  and  the  three  following  crops  are  unmanured. 
In  the  second  division  the  turnips  are  manured  with  3J  cwts.  of 
superphosphate  only,  and  are  carted  off  the  land ; all  the 
following  crops  are  unmanured.  In  1878  each  division  of  the 
field  was  half  in  beans  and  half  in  fallow.  Samples  of  soil  were 
taken  both  from  the  bean  land,  and  from  that  left  as  bare  fallow 
through  the  summer  ; each  plot  was  sampled  in  three  places,, 
but  only  to  the  depth  of  18  inches. 
In  1882  the  soil  bearing  the  fully-manured  rotation  was  again- 
sampled  ; it  wras  then  half  in  clover  and  half  in  fallow.  The 
clover-land,  and  that  under  bare  fallow,  were  each  sampled  in 
three  places,  to  the  depth  of  27  inches. 
Hoos  Field. — 1.  Wheat  and  Fallow. — Sampled  September  28, 
1878,  and  March  29,  1881.  The  experiment  with  alternate 
wheat  and  fallow',  both  unmanured,  has  been  in  progress  since 
1851.  Samples  of  soil  w’ere  taken  in  September  1878,  from 
three  places,  to  the  depth  of  18  inches,  both  on  the  wheat  and 
fallow  land.  In  March  1881,  the  wheat  land  was  again 
sampled  in  five  places,  to  the  depth  of  27  inches. 
2.  Clover-land. — Sampled  March  29,  1881,  and  July  26-31, 
1882.  This  portion  of  the  field  has  been  devoted  to  experi- 
ments with  clover  since  1849  ; but,  owing  to  the  repeated 
failure  of  the  crop,  the  land  has  very  frequently  been  in  the 
condition  of  bare  fallow  ; one  crop  of  wheat  and  three  of  barley 
have  also  been  taken.  The  five  plots  from  which  samples  of 
soil  were  taken  in  1881  had  been  manured  either  with  super- 
phosphate ; or  with  the  sulphates  of  potassium,  calcium,  and 
magnesium,  with  chloride  of  sodium  ; or  with  mixtures  of  these 
manures  ; but  they  had  received  no  nitrogenous  manure  since 
the  commencement  of  the  experiment  in  1849.  In  March  1881, 
single  samples  of  soil  were  taken  from  each  plot  to  the  depth 
of  27  inches.  The  analyses  were  made  on  a mixture  of  the  five 
samples. 
In  July  26-31,  1882,  samples  of  soil  were  taken  from  two 
portions  of  two  of  the  above  five  plots.  The  two  portions  with 
which  we  are  at  present  concerned  grew  respectively  Bokhara 
clover  ( Melilotus  leucantha),  and  white  clover  ( Trifolium  repens ). 
Both  of  the  plots  had  been  manured  with  the  sulphates  of 
potassium,  calcium,  and  magnesium,  and  chloride  of  sodium, 
with  superphosphate ; no  nitrogenous  manure  had  been  applied. 
