472 Mr. Chatterley’s Experiments on Saline Manures 
product of No. 3; indeed, the product of an acre would not 
then greatly exceed for 112lbs. of manure that for 26lbs. 
It will be observed that the produce of the three manures 
does not bear a relative proportion to the quantity of ni- 
trogen contained in each, but this gives us no reason for 
believing that such proportion would not hold good had the 
quantity of water contained in each been allowed for at the 
time of dressing. 
The attention of the practical agriculturist will probably be 
attracted to the last column of this table, in which is exhibited 
the profit on the expenditure in each case; taking the average 
value of the bushel at seven shillings, and of a truss of straw 
at ninepence, and calculating chaff as the same value as straw 
for fodder. ‘The difference between a quarter of a hundred 
weight anda hundred weight and a quarter of sulphate of am- 
monia is very remarkable, and, as may be easily perceived, is 
due to the difference of the value of the produce, the increase 
in the former instance being wholly in corn, while in the latter 
it is in both straw and corn, and it is probable that there is 
some quantity of the manure between these two extremes 
which would give the largest return relative to the outlay. It is 
clear however that if a farmer have but 1/. to lay out in ma- 
nure, that the quantity of sulphate of ammonia to be obtained 
for that sum would give a larger return if spread over four 
acres of land than if bestowed upon one. 
Sulphate of ammonia was also tried as a top-dressing upon 
a poor pasture, at the rate of one cwt. per acre; the opera- 
tion was performed in the evening after a shower of rain; it was 
observed on the following day that the clover and some of the 
grass were withered, indicating that the moisture which remain- 
ed on the leaves had caused the salt to adhere, and there form 
too strong a solution; in about a week after this period the 
grass assumed a greener colour, especially in one part of the 
field which had been dressed twice over to observe the effect : 
the crop of hay was not weighed, in consequence of rain 
coming on at the time of making, but was laid at half a load 
more to the acre than the undressed portion, and no doubt 
was entertained that by applying such a dressing earlier (it 
was not applied till the 12th of May), and in a less droughty 
season, more time would have been allowed for subsequent 
erowth, and a much larger crop would have been obtained. 
The after-feed was decidedly improved, and very much pre- 
ferred by the cattle. 
On the same date a quantity of sulphate of ammonia at the. 
same rate, was dressed over a single land in a field of ¢ares: 
the leaves of the plant withered, as in the instance of the pas- 
