625 
Uotation of Crops. 
Table VIII. — Experiments on the Rotation of — Roots , Barley , Clover ( or 
Beans), or Fallow, and Wheat ; in Agdell Field, Rothamsted. 8 courses, 
32 years, 1852-1883. ' 
AVERAGE AMOUNTS OF PHOSPHORIC ACID PER ACRE IN THE ROTATION CROPS, 
COMPARED WITH THOSE IN THE CROPS GROWN CONTINUOUSLY. 
Unmanured 
Superphosphate 
Mixed mineral and 
nitrogenous manure 

Roots carted 
Roots fed 
Roots carted 
Roots fed 
Roots carted 
Roots fed 
Fal- 
Beans 
Fal- 
Beaus 
Fal- 
Beans 
Fal- 
Beans 
Fal- 
Beans 
Fal- 
Beans 
low 
or 
clover 
low 
or 
clover 
low 
clover 
low 
or 
clover 
low 
or 
clover 
low 
or 
clover 
SWEDISH 
TURNIPS. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
Rotation 
1-20 
0-77 
1-11 
0-71 
7-91 
7-68 
8-83 
8-78 
16-67 
17-02 
18-14 
1712 
Roots 
Continuous 
0-88 
0-88 
0-88 
0-88 
4-14 
4-14 
4-14 
4T4 
9-91 
9 91 
9-91 
9-91 
Rotn.+ or — 
cont. 
0-38 
-0-11 
0-23 
-0-17 
3-77 
3-54 
4-69 
4-64 
6-76 
711 
8-23 
7-21 
Rotation 
0-29 
0-25 
0-28 
0-25 
1-27 
1-44 
1-36 
1-62 
2-79 
3-17 
3-04 
3-16 
Leaves 
Continuous 
0-25 
0-25 
0-26 
0-25 
1-16 
1-16 
1-16 
1-16 
3-07 
3-07 
3-07 
3-07 
Rotu.+ or — 
cont. 
0-04 
0-00 
0-03 
0-00 
0-11 
0-28 
0-20 
0-46 
-0-28 
0-10 
-0-03 
0-09 
Rotation 
1-55 
1-02 
1-39 
2 0-96 
9-18 
9-12 
10-19 
10-40 
19-46 
20-19 
21-18 
20-28 
Total 
Continuous' 
113 
1-13 
1-13 
1-13 
5-30 
5-30 
5-30 
5-30 
12-98 
12-98 
12-98 
12-98 
Rotn.+ or — 
cont. 
0-42 
-0-11 
0-26 
-0-17 
3-88 
3-82 
4-89 
5-10 
6-48 
7-21 
8-20 
7-30 
BARLEY. 
Rotation 
11-24 
11-59 
11-02 
9-89 
12-29 
11-91 j 
15-52 
16-16 
18-34 
18-63 
21-04 
20-90 
Grain • 
Continuous 
6*95 
6-95 
6-95 
6-95 
10-00 
10-00 
10-00 
1000 
21-31 
21-31 
21-31 
21-31 
ltotn. + or — 
cont. 
429 
4-64 
4-07 
2-94 
2-29 
1-J1 
5-52 
616 
-2-97 
-2-68 
-0-27 
-0-41 
Rotation 
1-87 
2-03 
1-82 
1-74 
1-80 
1-85 I 
2-32 
2-38 
2-87 
2-96 
3-68 
3-53 
Straw 
Continuous 
1-10 
1-10 
1-10 
1-10 
1*33 
1-33 
1-33 
1-33 
3-30 
3-30 
3-30 
3-30 
Rotu. + or — 
cont. 
0-77 
0-93 
0-72 
0-64 
0-47 
0-52 I 
0-99 
105 
-0-43 
-0-34 
038 
0-23 
Rotation 
13-11 
13-62 
12-84 
3 1 1*63 
14-09 
13 76 
17-84 
18-54 
21-21 
21-59 
24-72 
24-43 
Total 
Continuous 
8-05 
8-05 
8-06 
8-05 
11-33 
11-33 1 
11-33 
11-33 
2461 
24-61 
24-61 
24-61 
. Rotn. + or — 
cont. 
5-06 
5-57 
4-79 
3-58 
2-76 
2-43 
6-51 
7-21 
-3-40 
-302 
Oil 
-0T8 
BEANS (6 COURSES), CLOVER (2 COURSES), OR FALLOW. 
Rotation 
51 5 
5-14 
6-81 1 
8-18 
11-49 
1305 
Corn 
Continuous 
211 
2 11 
3-16 
3-16 
6-75 
C*75 
Rotn.+ or — 
cont. 
3-04 
303 
3-65 
5-02 
4-74 
6-30 
Rotation 
1-17 
117 
1-78 
1-97 
1-99 
206 
Straw 
Continuous 
C-63 
0-63 
0-95 
0-95 
1-24 
1-24 
Rotn. 4* or - 
cont. 
0-54 
0-54 
0*83 , 
1-02 
0-75 
0-82 
Rotation 
6-32 
6-31 
8-59 
10-15 
13-48 
15-11 
Total 
Continuous 
2-74 
2 74 
4-11 
4-11 
7-99 
7-99 
Rotn.+ or - 
cont. 
3-58 
3-57 
4*48 1 
6-04 
5-49 
7-12 
Clover 
Rotation 
8-04 
2 G96 
20-30 j 
22-99 
31-69 
34'29 
Continuous 
1 
? 
? 
? 
? 
? 
Average of 8 courses, ) 
beans and clover J 
6-75 
3 6*48 
11-52 
13-36 
1803 
19-90 
WHEAT. 
Rotation 
12-53 
11-18 
1219 
10-50 
14-48 
14-23 
14-68 
15-25 
15-12 
16-50 
14-58 
16-43 
Grain 
Continuous 
6-45 
6*45 
6-45 
6-45 
7-99 
7-99 
7-99 
7-99 
12-40 
12-40 
12-40 
12-40 
Rotn. + or — 
cont. 
6-08 
4-73 
574 
4-05 
6-49 
6-24 
6-69 
7-26 
2-72 
4*10 
2-18 
403 
Rotation 
2-87 
2-73 
2-76 
2-48 
3-87 
3-75 
3-84 
3-95 
4-94 
5-46 
5-00 
6-31 
Straw 
Continuous 
1-27 
1-27 
1-27 
1-27 
1-88 
1-88 
1-88 
1-88 
3-62 
3-62 
3-62 
3-62 
lRotn.+ or- 
cont. 
1-60 
1-46 
1-49 
1-21 
1-99 
1-87 
1-96 
2-07 
1-32 
1-84 
1-38 
1-69 
Rotation 
15-40 
13-91 
14-95 
3 12-98 
18-35 
17-98 
18-52 
19-20 
20-06 
21-96 
19-68 
21-74 
Total 
Continuous 
7-72 
7*72 
7-72 
7-72 
9-87 
9-87 
9-87 
9-87 
16-02 
16-02 
16-02 
1602 
Rotn.+ or - 
cont. 
7-68 
6-19 
7-23 
5-26 | 8-48 
8-11 
8-66 
9-33 
404 
5-94 
3-56 
5-72 
1 Average 19 years, 1819-52 and 1856-70. ’ Probably crop too low owing to a dell. 
