for Twenty Years in succession on the same Land. 325 
so that at the end of that period there remained seven-tenths, 
or more, of the large amount applied still to be accounted for. 
, Table XLII. — Effects of the Unexhausted Residue of Nitrogen applied to Wheat as 
Ammoni<a-salts. 
PRODUCE PER ACRE. 
It 
Total CoRJf in BnsHEUi or 61 lbs. 
Stbaw (and Chaff). 
Total Proddce (Com and Straw). 
EARS. 
Plot 6. 
Mixed 
Mineral 
Manure 
alone, 
20 Years, 
1852-'71. 
Plot 16. 
Mixed 
Mineral 
Manure, 
and 800 lbs. 
Ammonia- 
salts, 
13 Years, 
1852-64 ; 
Unmanured 
since. 
Plot 16, 
over (or 
under — ) 
Plot 6. 
Plot 5. 
Mixed 
Miners 1 
Manure 
alone, 
20 Years, 
1852-'71. 
Plot 16. 
Mixed 
Mineral 
Manure, 
and 800 lbs. 
Ammonia- 
salts, 
13 Years, 
1852-64 ; 
Unmanured 
since. 
Plot 16, 
over (or 
under — ) 
Plot 6. 
Plot 5. 
Mixed 
Mineral 
Manure 
alone, 
20 Years, 
1852-71. 
Plot 16. 
Mixed 
Mineral 
Manure, 
and 800 lb?. 
Ammonia- 
salts, 
13 Years, 
1852- 64; 
Unmiinured 
since. 
Plot 16, 
over (or 
under — ) 
Plot 5. 
.■erage, 
'■ years, 
i)2-'61 
18G5 
ISG6 
1867 
1868 
1869 
1870 
1871 
j Bushels. 
15 
131 
9i 
18i 
15i 
191 
I2i 
Bushels. 
403 
34f 
18i 
14J 
233 
16i 
19f 
132 
Bushels. 
22 
19| 
4| 
5.1 
5i 
1 
Cwts. 
16| 
lOJ 
133 
9i 
12 
14i 
12J 
123 
Cwts. 
463 
25f 
17^ 
14i 
18i 
14| 
12 
13| 
Cwts. 
303 
15^ 
53 
6i 
-03 
0| 
lbs. 
j 3,009 
2,091 
2,303 
1,613 
2,481 
2,543 
2,564 
2,207 
lbs. 
7,713 
5,007 
3,081 
2,512 
3,503 
2,647 
2,557 
2,380 
lbs. 
4,704 
2,916 
778 
899 
1,022 
104 
-7 
173 
tal .. 
104i 
1411 
37i 
843 
1161 
321 
15,802 
21,687 
5885 
erage 
145 
20| 
5i 
12 
161 
45 
*5 
2,257 
3,098 
841 
Stated broadly and in round numbers, the result is as follows: — 
By the actual utilization, or appropriation, of say three-tenths 
of the nitrogen annually supplied, there was obtained, over the 
13 years of the application, an average produce of nearly 
41 bushels of wheat grain, and more than cwts. of straw, 
or an average annual increase over the produce by the mixed 
mineral manure alone, during the same period, of 22 bushels of 
grain and 30 cwts. of straw. During the 7 succeeding years, 
the seven-tenths of the supplied nitrogen, which was not thus 
recovered in the increase of crop in the years of its application, 
yielded an average annual produce of only 20 j bushels of grain 
and 16^ cwts. of straw, or an average annual increase over the 
produce by the mineral manure alone (Plot 5) of only 5 J bushels 
of grain and 4-| cwts. of straw ; whilst during the last 3 years 
there was scarcely any increase at all. In fact, of the 13 years 
application, and the 13 years unrecovered nitrogen, amounting to 
about seven-tenths of the whole supplied, less than the quantity 
left unrecovered in one year, was effective during the 7 succeeding 
z 2 
