and  Subsoils  of  some  of  the  Fields  at  Rothamsted.  339 
Table  III. — The  Quantity  of  Nitrogen  as  Nitrates  found  in 
Fallow  and  Cropped  Land  variously  manured. 
Nitrogen  as  Nitrates  in  Lbs. 
per  Acre. 
No. 
Previous  Cropping  and  Manuring. 
First 
Nine 
Inches. 
Second 
Nine 
Inches. 
Third 
Nine 
Inches. 
Total. 
Clay  Croft  Field  : sampled  October  3,  1881. 
1 Fallow  (ordinary  cultivation) 
1G-4  2G-5 
15-9 
58-8 
Foster’s  Field  : sampled  October  3,  1881. 
2 
Fallow  (ordinary  cultivation) 
14 -6 
24  "G 
173 
56-5 
Agdell  Field  : sampled  September  24-25,  187 
8. 
3 
Fallow  (Rotation  fully  manured)  .. 
300 
18-8 
not  taken 
48-8 
4 
Beans  „ „ „ .... 
Fallow  (Rotation,  superphosphate  only) 
12  1 
8-4 
20-5 
5 
223 
14-0 
?> 
36-3 
G 
Beans  ,,  „ „ 
7-2 
3-3 
V 
10-G 
Agdell  Field:  sampled  September  8,  1882. 
7 
Fallow  (Rotation  fully  manured)  .. 
40-1 
14-3 
5-5 
59-9 
8 
Clover  „ „ „ .... 
a 
11-4 
4-8 
3-4 
19 -G 
Hoos  Field  : sampled  September  28,  1878. 
9 
FaUow  (unmanured  land)  
28-5 
5-2 
not  taken 
33-7 
10 
Wheat  „ „ 
2-6 
trace 
2-6 
Hoos  Field  : sampled  March  29,  1881. 
11 
Wheat  (unmanured  land)  
7-5 
3-6 
3-4 
14-5 
12 
Clover  (superphosphate  and  alkalies) 
12-3 
8-4 
18-2 
38-9 
It  is  obvious  that  the  quantity  of  nitrate  found  in  a soil  at  the 
end  of  a summer’s  fallow  does  not  represent  the  whole  quantity  of 
nitrate  formed  in  the  soil  in  the  course  of  a year  ; a part  of  this 
has  been  already  removed  by  drainage,  and  has  passed  into  the 
subsoil.  The  experiments  at  Rothamsted  afford  some  means  of 
estimating  this  loss  by  drainage.  The  fallows  we  have  just  men- 
tioned followed  crops  of  barley.  We  may  assume  that  in  July, 
after  the  blooming  of  the  barley,  the  soils  to  the  depths  in 
