Experiments at Rothamsted on the Growth of Wheat Year after Year on the same Land. 
Diagram 1. — Showing the*en'ects of Ammonia-salts Year after Year, alone, and with occasional Mineral Manure, &c. 
Dole. 
3 
1844. 
1845. 
1846. 
1847. 
1848. 
1849. 
185C 
i. 
1851. 
1852. 
1853. 
1854. 
1855. 
1856. 
1857. 
1858. 
1859. 
1860. 
1861. 

1862. 
1863. 
AVERAGE ANNUAL. 
19 Yeaks. 1845-1*). 
Produce. | Increase. 
Dressed Corn per Aire, ii 
Bushels and Pecks. 
15 0 
23 02 
17 33 
16 
3i 
14 3 
19 1 
15 .11 
15 31 | 
13 31 
5 31 
21 0| 
17 0 
14 2 
19 32 
18 0 
18 H 
12 31 
11 11 
16 0 
17 1 
16 H 
10a 
106 
15 1} 
31 3i ' 
27 1| 
25 
3 1 19 1 
32 22 
26 Sjl 
28 31 
21 31 1 
9 32 
34 11 
19 32 j 
24 02 
29 01 | 22 31 
18 32 
15 01 1 12 3| 1 2.'! 01 
39 01 1 
( 24 12 
8 01 
31 31 
17 21 | 25 | 
25 " 
32 1J 
17 S3 
28 21 22 01 j 
15 2 39 03 
28 01 1 27 22 
34 2 27 3 
25 2 
18 21 15 ' 32 | 24 31 
43 21 
26 1 J 
■ 
10 0} 
Diagram 2. — Showing the effects of Am 
eparatcly, in alternation, and in combination. 
•nonia-salts, and Mixed Mineral Manure, applied 
Plots. 
1852. 
1853. 
1854. 
1855. 
1856. 
1857. 
1858. 
1859. j 1860. 
1861. 
1862. 
1863. 
AVERAGE ANNUAL, 12 Ymm. 1852-03. 
J Froduoc. | Increase, j Description of Mwiure. 
Dressed Corn per Acre, i 
i Bushels aud Pecks. 
:! 
13 3* 
21 Oi 
0 
14 2 
19 32 
18 
5 
18 11 
12 31 
11 H 
16 0 
1 17 1 
1 15 2 1 
Unmanured, every year (also for 8 preceding years). 
Mixed Mineral Manure alone, every year. 
16 3i 
io 0i 
24 02 
18 
li 
19 2i 
23 3 
19 
) 
20 21 
15 33 
15 li 
17 31 j 
19 23 
18 12 
2 32 
17 
24 33 
8 22 
' 44 01 
18 
02 
31 0 
20 li 
20 2 
18 2| 
27 3 
21 1 
18 3i 
3 11 
Mixed Mineral Manure alternated with Ammonia-salts (Plots 17 and 18). 
Ammonia-salts alternated with Mixed Mineral Manure (Plots 17 and 18). 
IS 
14 H 
If H 
23 3i 
oj 
17 33 
40 2i 
21 
H 
15 31 
32 31 
18 2 
j 46 li' 
■XI 21 1 17 Oi 
In-/ 
111/, 
1 34 li 
19 
1 24 03 
29 01 
! 22 
31 
18 33 
15 01 
12 31 
23 01 
39 0J" 
22 21 
7 01 
Ammonia-salts alone, every year (also for 7 preceding years). 
Ammonia-salts alone, every year (also in the preceding year). 
Ammonia-salts and Jlixed Mineral Manure, every year. 
22 OJ 
| 15 2 

39 03 
28 
0i 1 27 23 I 34 2 
I 27 
25 2 
18 21 
15 32 
24 31, 
43 21 
26 32 
11 13 
j 23 24 
45 13 
~33 
1° 
(30 32 1 44 31 
1 39 
H1- 
34 23 
27 22 
34 3| 
i " — Ti — : 
35 3M 53 2} 
36 1 1 
20 31 
Unmanured, 
Amraoniu-salts alune. 
Mixed Mineral Manure alone. 
Ammonia-salts and Mixed Mineral Manure. 
