322 Report of Experiments on the Growth of Barley, 
<liminisbetl, or accumulation tending to increased, productiveness 
from year to year. 
In our Report on the growth of wheat for 20 years in succes- 
sion on the same land, the question of the effects of the 
unexhausted residue from previous manuring upon succeeding 
crops, was considered so far as evidence was then at command, 
and it is proposed to give some further illustrations relating to 
that crop. The experiments on barley afford but few illustrations 
of the point ; but it will be instructive to call attention to such 
as are available, to consider how far their indications agree with, 
and how far they differ from, those relating to wheat, and to 
endeavour not only to explain the general facts observed, but to 
ascertain the reason of any differences of result with the two 
crops. 
The effects of the unexhausted residue of nitrogen, supplied 
as ammonia-salts or nitrate of soda, will first be considered. 
Table XL. relates to experiments on barley with ammonia- 
Table XL. — Effects of the Unexhausted Residue of Nitrogen applied to Barley' as 
Ammonia-salts. 
PRODUCE PER ACRE. 
Total Corn in Bdshels of 52 lbs. 
Steaw (and Chaff). 
Total PBOnucE (Corn and Straw! 
Yeaes. 
Mixed Mineral 
Manure every Year, 
and — 
Mixed Mineral 
Manure every Year, 
and — 
Mixed Mineral 
Manure every Year, 
and — 
Plot 4 A. 
200 lbs. 
Ammonia- 
salts 
every 
Year. 
Plot 4 AA. 
4U0 lbs. 
Ammonia- 
salts, 
6 Years, 
1852- 57 ; 
2un lbs., 
10 Years, 
1858- 67. 
4 AA 
over (or 
under — ) 
4 A. 
Plot 4 A. 
200 lbs. 
Ammonia- 
salts 
every 
Year. 
Plot 4 AA. 
400 lbs. 
Ammonia- 
salts, 
6 Years, 
1852-57; 
200 lbs., 
10 Years, 
1858-'67. 
4 AA, 
over (or 
under — ) 
4 A. 
Plot 4 A. 
200 lbs. 
Ammonia- 
salts 
every 
Year. 
Plot 4 AA. 
400 lbs. 
Ammonia- 
salts, 
6 Years, 
1852- 57 ; 
200 lbs., 
10 Y. ars, 
18o«-'67. 
4 AA, 
over (or 
under - 
[4 A. 
Average, 
6 years, 
1852-'57 
1858 
1859 
1860 
1861 
1862 
1863 
1864 
1865 
1866 
1867 
■j Bushels. 
49^ 
55i 
38J 
451 
58f 
52i 
61i 
63J 
49 
50i 
47| 
Bushels. 
535 
601 
40^ 
48J 
mi 
541 
65J 
63i 
51§ 
56f 
49i 
Bushels. 
4 
5 
If 
2i 
l| 
n 
2^ 
Cwts. 
291 
29i 
271 
26i 
30J 
31| 
32 
341 
22 J 
27^ 
25J 
Cwts. 
36i 
353 
30i 
29 
33| 
33^ 
34f 
37f 
24i 
281 
281 
Cwts. 
7J 
^ 
u 
21 
2i 
2i 
Oi 
25 
lbs. 
5,863 
6,192 
5,067 
5,355 
6,472 
6,273 
6,791 
7,225 
5,075 
5,704 
5,304 
lbs. 
6,874 
7,160 
5,517 
5.746 
6,937 
6,529 
7,323 
7,469 
5,469 
6,117 
5,753 
lbs. 
1,011 i 
968 
450 
391' 
465 
256 
532 
244 
394 
413 
449 
Total .. 
523^ 
551J 
273 
2871 
315j 
28 
59,458 
64,020 
4,562 
Average 
523 
55J 
2J 
28J 
31i 
2J 
5,946 
6,402 
45C 
