for Twenty Years in succession on the same Land. 299 
Table XXXIV. — Average Annual Produce and Increase by 400 lbs. Ammonia-salts^ 
and Mineral Manure. 
Six Years, 1852-1857. 
MANURES PER ACRE, PER ANNUM. 
Average 
Annual 
Produce. 
6 Years, 
1852-'57. 
Average Annual Ikckease, 6 Yeabs. 
Plots. 
400 lbs. Ammonia-salts, 
and 
Mineral Manures as under. 
Over 
Mean 
Unmanured. 
Over 
corresponding 
Mineral 
Manures. 
Over 
corresponding 
Mineral 
Manures 
and 200 lbs. 
Ammonia-saltSv 
Dressed Corn per Acre — Bushels. 
2 AA 
3 AA 
4 AA 
Superphosphate of Lime 
Superphos. and Mixed Alkali-salts 
49s 
425 
50f 
2U 
14f 
22| 
18 
14 
161 
4J 
H 
4i 
Total Corn 
per Acre — 
lbs. 
2 AA 
3 AA 
4 AA 
Superphos. and Mixed Alkali-salts 
2775 
2441 
2801 
1177 
843 
1203 
1027 
814 
887 
230 
169 
205 
Straw (and Chaff) per Acre 
— Cwts. 
2 AA 
3 AA 
4 AA 
Superphos. and Mixed Alkali-salts , 
34 
361 
17i 
13i 
2Q\ 
171 
131 
18i 
5i 
4? 
n 
Total Produce (Corn, Straw, and Chaif) per Acre — lbs. 
2 AA 
3 AA 
4 AA 
Superphosphate of Lime 
Superphos. and Mixed Alkali-salts 
6590 
5753 
6874 
3170 
2333 
3454 
2996 
2330 
2948 
872 
697 
lOU 
Weight per Bushel of Dressed Corn — lbs. 
2 AA 
50-5 
- 1-2 
- 1 
3 
-1-0 
3 AA 
50-8 
- 0-9 
- 1 
2 
-1-0 
4 AA 
Superphos. and Mixed Alkali-salts 
50-4 
- 1-3 
- 1 
5 
-1-6 
Corn to 100 Straw. 
2 AA 
73-1 
-15-1 
-21 
8 
-6-9 
3 AA 
74-1 
-14-1 
-16 
9 
-8-0 
4 AA 
Superphos. and Mixed Alkali-salts 
69-4 
-18-8 
-26 
5 
-99 
Indeed, the double amount of ammonia-salts was found, even 
when used in conjunction with mineral manure, to be quite 
excessive, the crops being generally laid ; and hence, after sis 
