14 
BULLETIN 1377, U. 
S. DEPARTMENT OF AGRICULTURE 
In Table 4 are presented the yields of wheat on the Broadbalk 
and Agdell fields for each year that wheat has been grown in rotation 
on the latter field. In Table 5 are given similar data for barley. 
These results are here given in detail so as to form the basis for fur- 
ther study. 
Table 4. — Yields of wheat grown in continuous culture and in roiation, Rothamsted 
(Yields in Winchester or American bushels] 
Years 
Yields per acre on the 
Broadbalk field, contin- 
uous culture 
Yields per acre on the Ag- 
dell field, rotation 
Unfertilized ' 
plot 3 
Fertilized 
plot 6 
Unfertilized 
plot 6-0 
Fertilized 
plot 2-C 
1851 
Bushels 
16.38 
17.54 
18.96 
17.80 
9.16 
9.68 | 
8.90 
4.90 
14.32 
15. 35 
14.19 
10.32 
12.38 
7.84 
9.39 
12.90 
12.49 
9.49 j 
Bushels 
33.22 
28.90 
30.81 
40.89 
16.25 
17.54 
16.80 
10.84 
28.51 
24.00 
26. 96 
21.80 
19.35 
18.37 
24.67 
17.75 
27.55 
20.12 
Bushels 
29.41 : 
36.38 
36. 38 
35.22 
21.67 
21.29 
22.32 
10.71 
30.32 
26. 45 
30. 44 
23.99 
31.22 
19.74 
22.08 
25.28 
6.50 
3.51 
Bushels 
29.80 
1855 
38.57 
1859 . 
41.02 
1863 
47.60 
1867 
24.51 
1871 
24.76 
1875... 
32.90 
1879 
13.42 
1883 
46.57 
1887 
43.60 
1891 „ 
45.80 
1895... 
40.25 
1899 
44.25 
1903 
29.15 
1907 
30.24 
1911 
39.22 
1915 
1919 
10.84 
2.27 
Average (18 crops) 
12.33 ! 
23.58 
24.05 
32.49 
Table 5. — Yields of barley grown in continuous culture and in rotation, Rothamsted 
[Yields in Winchester or American bushels] 
Years 
Yields per acre on the 
Hoos field, continuous 
culture 
Yields per acre on the Ag- 
dell field, rotation 
Unfertilized 
plot 1-0 
Fertilized 
plot 4-A 
Unfertilized 
plot 6-0 
Fertilized 
plot 2-C 
1853 
Bushels 
26. 57 
26.96 
16.77 
18.58 
15.74 
14.45 
17.67 
18.45 
9.55 
11.61 
8.41 
•5.20 
5.20 
6.71 
13.42 
21.78 
Bushels 
39.47 
59.22 
56.38 
47.99 
50.83 
48.38 
52.12 
43.98 
33.02 
36.89 
31.73 
31.48 
25.54 
36.64 
45.72 
65.64 
17.75 
31.27 
Bushels 
35.48 
50.05 
39.86 
40.25 
25.41 
24.25 
24.25 
27.61 
12.51 
11.35 
17.42 
11.87 
23.99 
7.53 
Bushels 
39.47 
1857 
49.54 
1861 
62.57 
1865.. 
49.02 
1869... 
44.25 
1873 
32.77 
1877 
35.86 
1881. 
36.51 
1885 
35.86 
1889 
27.48 
1893 
20.90 
1897 
31.22 
1901 
27.09 
1905 
32 41 
1909 
10. 32 3<t 47 
1913 
25.39 
2.58 
2.48 
33.54 
1917 
1921 
8.15 
7.84 
15.48 
26.52 
Average (18 crops). 
The results of a study of the averages of these wheat and barley 
yields obtained at Rothamsted are summarized in Tables 6 and 7. 
