Agricultural Cliemistnj. 
479 
experience of practical farminof in the use of guano, and other 
nitrogenous manures, for the increased production of the cereal 
grains. 
Table V. — Sliowins; the influcnoo upon the Wheat Crop, in the second season, 
of Nitrogen supplied in Manure (but not recovered in increase) in the pre- 
ceding season. 
Plots. 
Sea-;ons. 
Ammonia- 
salts emploveii. 
With or 
without Minerals. 
Increase of 
Total Produce 
(Corn and Striw 
per acre). 
10 a. 1 
184.5 
1846 
U.S. 
336 
224 
none 
none 
lbs. 
2,093 
1,374 
10 6. 1 
1845 
184C 
330 
none 
none 
none 
2,093 
49 (less) 
8 6. 1 
1847 
1848 
400 
none 
minerals 
do. 
2,715 
82 
5 a. 1 
1851 
1852 
600 
none 
minerals 
do. 
3,477 ■ 
408 
r. h. 1 
1851 
1852 
GOO 
none 
minerals 
do. 
3,778 
624 
Secondly, Baron Liebig says— 
" If it had accidentally occurred to Mr. Lawes to maniire his field with 
4, 5, or fi cwt. of ammonia-salts, instead of with 3^ cwt., and if in those cases 
the yield was not increased (as we may ivith certainty assume would happen), 
then he might with the same justice assert that the loss of ammonia is 
6, 8, or 10 lbs. for every bushel of increased yield. 
"Or if Mr. Lawes had applied animonia-.salts at the rate of 2 or 1 cwt., 
instead of 3^ cwt. the acre, and then, after previous manuring with dissolved 
bones and silicate of iMtash, (whose action he lias not taken at all into 
account), had harvested the same increase of 8 bushels ; his conclusion that 
the soil snU'ers a loss of ammonia, would doubtless have been vastly modified. 
He has made the loss and not found it." — The Country Gentleman, Nov. 1, 
1855. 
And again — 
It never seems to have occiu'red to !Mr. Lawes to determine the minimum 
of a:umonia which was effective upon his field in producing maAimum crops." 
—Ibid. 
Doubtless it will be highly satisfactory to Baron Liebig to' 
learn, that it has occurred to us to supply almost identically 
all the cases here demanded. Thus, instead of using onlv 
400 lbs. of ammonia-salts, which is rather more than on the 
average of seasons is adapted to our soil, we have, over a series 
of years, employed 600 lbs. and 800 lbs. of these salts ; and the 
result has been exactly the reverse of what Baron Liebig savs 
'• ice viay with certainty assume would liapjjen.''^ That is to say, 
2 I 2 
