240 Report of the Field and Feeding Expei'iments 
itself, in each case, in the yield of grain per acre, in the weight 
per bushel of the grain, and in the quantity of straw ; and it was 
quite evident to the eye on inspection of the crop just before 
harvest. The corn was riper, and the straw was of a better 
colour, with the ammonia-salts than with the nitrate. 
The absence of all effect from the farmyard-manure is very 
remarkable. Owing to the long continuance of wet weather 
during the winter (1876-7), there may have been a considerable 
loss of the soluble nitrogen of the manure by drainage through 
such a porous soil ; but this supposition does not seem to afford 
a sufficient explanation of the entire want of action. 
The absence of all effect from mineral manures, used alone, 
must be taken to show that the previous wheat crop had gathered 
up all the available nitrogen from the soil, excepting so much as 
the unmanured crop could make use of. On the other hand, the 
large increase of produce, amounting to from 10 to 13 bushels of 
corn, and from 14 to 17 cwts. of straw, per acre, by the appli- 
cation of ammonia-salts or nitrate of soda alone, shows that the 
soil contained, in an available condition, sufficient of all the 
necessary mineral constituents for the crop. 
When, in conjunction with mineral manures, nitrogen = 50 lbs. 
of ammonia per acre was applied, either as ammonia-salts or as 
nitrate of soda, more increase of produce was obtained for a 
given amount of nitrogen in the manure, than when nitrogen 
= 100 lbs. of ammonia per acre was so applied. It thus appears 
that the larger amount of soluble nitrogen was more than could 
be turned to account by the growing crop in the particular soil 
and season. Yet, nitrogen =100 lbs., and 200 lbs. ammonia 
per acre, when applied as dung, was without effect. 
The Expeeiments on the Continuous Growth 
OF Barley. 
Stack-1/ard Field. — The experimental barley, like the experi- 
mental wheat, was grown after the wheat crop of 1876, taken by 
the previous tenant, as already referred to. The manures 
applied for the barley were the same as those for the wheat. 
For the wheat the dung was taken from the yard ; for one plot 
in quantity estimated to contain nitrogen corresponding to 
100 lbs., and for the other to 200 lbs. ammonia per acre. For 
the barley, however, the dung was made in the experimental 
boxes, at Crawley Mill Farm, and, both food and litter being 
weighed, the composition of the dung applied could be estimated 
with greater accuracy. 
The following table shows the produce obtained : — • 
