and  Subsoils  of  some  of  the  Fields  at  Rotliamsted.  335 
Samples  of  soil  were  taken  from  two  places  on  each  plot  to  the 
depth  of  54  inches. 
3.  Barley-land. — Sampled  February  24  to  March  7,  1882.  A 
large  part  of  Hoos  Field  has  been  continuously  cropped  with 
barley  since  1852.  Particulars  as  to  the  manures  applied,  and 
the  produce  obtained  on  those  plots  with  which  we  are  at  present 
concerned,  will  be  found  in  Table  I.  The  “ mixed  mineral 
Table  I. — Manuring  and  Annual  Produce  per  Acre  of  certain  Plots 
in  Hoos  Barley  Field. 
Average  Produce, 
Produce, 
30  years, 
1852-81. 
1881. 
LOT. 
Manuring. 
Total 
Total 
Dressed 
Produce 
Dressed 
Produce 
Com. 
(Corn  and 
Corn. 
(Com  and 
I 
Straw). 
Straw). 
Bushels. 
lbs. 
Bushels. 
lbs. 
1 
0. 
Unmanured 
17? 
2150 
17? 
1609 
2o. 
Superphosphate 
23 
2604 
19* 
1822 
3o. 
Sulphates  of  Potassium,  Sodium, Magnesium 
19? 
2296 
17? 
1709 
4o. 
Mixed  Mineral  Manure  
24i 
2753 
17? 
1770 
1 
A. 
200  lbs.  Ammonium-salts 
30f 
3612 
33? 
3249 
2 
A. 
„ Amm.-salts,  and  Superphosphate 
44? 
5368 
43| 
4195 
3 
A. 
„ „ , and  Sulp.Pot.,  Sod.,  Mag. 
331 
4023 
37? 
3776 
4 
A. 
„ „ , and  Mixed  Minerals  . . 
44  j 
5534 
42? 
4392 
1 AA. 
275  lbs.  Nitrate  of  Sodium 
34? 
4147 
34? 
3762 
2 AA. 
„ Nit.  Sod.,  and  Superphosphate  .. 
40? 
5784 
43* 
4141 
3 AA. 
„ „ , and  Sulph  Pot.,  Sod., Mag. 
34? 
4421 
36j| 
4152 
4 AA. 
„ „ , and  Mixed  Minerals  .. 
47? 
6007 
47* 
5114 
1 c. 
1000  lbs.  Rape-cake  
43J 
5243 
41? 
4576 
2 c. 
„ „ , and  Superphosphate  .. 
45 
5515 
48 
5240 
3 c. 
„ „ , and  Sulph.Pot.,Sod.,Mag. 
41* 
5168 
40* 
4417- 
4 c. 
„ „ , and  Mixed  Minerals  .. 
45* 
5661 
45 
4778 
7 1 
Unmanured  (Farmyard-manure,  1852-71) 
34i* 
4020* 
29? 
3063 
7 2 
14  tons  Farmyard-manure 
40 
6040 
53* 
5707 
* Average  produce  of  10  years  (1872-81)  without  manure. 
manure”  consists  of  superphosphate,  with  the  sulphates  of  potas- 
sium, sodium,  and  magnesium.  The  ammonium-salts  are  a 
mixture  of  equal  parts  sulphate  and  chloride.  The  manures  are 
all  ploughed-in  in  the  spring,  before  sowing  the  barley.  The 
samples  of  soil  were  taken  between  February  24  and  March  7, 
1882,  from  four  places  on  each  plot,  to  the  depth  of  27  inches. 
