336 
Nitrogen  as  Nitric  Acid,  in  the  Soils 
Clay  Croft  and  Foster  s Field. — Sampled  October  3—4,  1881. 
These  two  fields  are  under  the  ordinary  cultivation  of  the  farm. 
The  preceding  cropping  in  each  case  had  been — barley  with 
guano  in  1880,  barley  with  superphosphate  and  nitrate  of  sodium 
in  1879,  wheat  with  nitrate  in  1878.  Foster’s  Field  had  received 
dung  in  1877  ; Clay  Croft  being  at  the  same  time  fallow".  Both 
fields  were  in  bare  fallow"  when  sampled.  Samples  were  taken 
in  each  case  from  three  places,  to  a depth  of  27  inches. 
Broadbalk  Field. — Sampled  October  10-18,  1881.  This 
field  has  been  continuously  cropped  with  wheat  since  1843—4 ; 
the  manuring  and  average  produce  of  the  plots  with  which  we  are 
concerned  at  present  will  be  found  in  Table  II.  The  “mixed 
mineral  manure  ” and  the  “ ammonium-salts  ” are  similar  to 
those  applied  to  the  barley  in  Hoos  Field.  The  ammonium- 
Table  II. — Manuring  and  Annual  Produce  per  Acre  of  certain  Plots  in 
Broadbalk  Wheat-Field. 
Average  Produce, 
1852-81. 
Produce, 
1881. 
Plot. 
Mxxvrixg. 
Dressed 
Cora. 
Total 
Produce 
(Cora  and 
Straw). 
Dressed 
Com. 
Total 
Produce 
(Com  and 
Straw). 
2 
14  tons  Farmyard-manure  
Bushels. 
33* 
lbs. 
5696 
Bushels. 
30* 
lbs. 
4274 
3 
Unmanured  
13$ 
2108 
13* 
2009 
4 
Unmanured  
14 
2228 
12* 
1591 
5a 
Mixed  Mineral  Manure 
15$ 
2394 
12* 
1715 
6 a 
200  lbs.  Ammonium-salts  and  Mixed  Minerals 
23$ 
3954 
21$ 
2928 
7a 
400  lbs. 
32* 
5710 
27* 
4007 
8a 
600  lbs.  „ „ „ 
36$ 
6778 
32* 
5255 
9a 
550  lbs.  Nitrate  of  Sodium  and  Mixed  Minerals 
36$ 
6903 
35* 
5911 
9b 
550  lbs.  Nitrate  of  Sodium,  alone 
23$ 
4293 
22* 
3241 
10  a 
400  lbs.  Ammonium-salts,  alone  
204 
3450 
18* 
2465 
10  b 
400  lbs.' Ammonium-salts,  alone  
23i 
3923 
19* 
2658 
11a 
400  lbs.  Amm. -salts,  and  Superphosphate  . . 
26$ 
4387 
22 
3020 
12  a 
„ „ , Superphos.  Sulp.  Sodium 
31* 
5326 
25$ 
3409 
13  a 
„ „ , Superphos.  Sulph.  Potass. 
31 
5472 
28$ 
4056 
14  a 
„ „ , Superphos.  Sulph.  Mag. 
31$ 
5465 
28$ 
4015 
15  a 
„ ,,  , Mixed  Minerals  (*) 
30f 
5289 
25* 
3452 
16  a 
Unmanured  since  1865  
C)  Hf 
2356 
13$ 
1720 
17a 
Mixed  Mineral  Manure  (3)  
(\  15$ 
2549 
13$ 
1752 
18  a 
400  lbs.  Ammonium-salts  (3 
t5;  29* 
5145 
31* 
4437 
19 
1700  lbs.  Rape-cake  (6) 
28* 
4758 
24* 
3353 
(')  For  1872,  and  previously,  400  lbs.  Sulphate  of  Ammonium,  with  Mixed  Minerals. 
(2)  Average  produce  of  17  years,  1865-81,  without  Manure;  previously  manured  with 
800  lbs.  Ammonium-salts  and  Mixed  Minerals. 
(3)  The  Manures  on  these  two  Plots  alternate  each  year. 
(4)  Average  produce  of  Mineral  Manure,  alternating  with  Ammonium-salts. 
(5)  Average  produce  of  Ammonium-salts,  alternating  with  Mineral  Manures. 
(6)  For  1878,  and  previously,  300  lbs.  Sulphate  of  Ammonium,  500  lbs.  Rape-cake,  with 
Superphosphate  prepared  with  Hydrochloric  Acid. 
