Report on the Field and Feeding Experiments at Wohurn. 341 
every possible accuracy by a trained chemist, the single 
bushels and the whole produce being separately weighed. 
In Table I. (p. 342) are given the manurial treatment of each 
plot, and the produce per acre of corn and straw. 
On all the plots except those to which farmyard-manure was 
applied, the produce of straw was below that yielded in 1882. 
The produce of corn was in every case, except that of plots 2 
and 5, higher than the results obtained in 1882 by similar 
treatment. On the unmanured plots the increase was 243 lbs. 
and 354 lbs. respectively. Where ammonia-salts and nitrate of 
soda respectively were applied in conjunction with mineral 
manures, there was a difference of 415 lbs. per acre in favour of 
nitrate of soda over last year's produce, the ammonia-salts 
giving 92 lbs. less, and the nitrate of soda 323 lbs. more than 
in 1882. Similarly, when these salts were applied alone, with- 
out minerals, the nitrate of soda gave about the same produce 
as before, while that of the ammonia-salts was less by 462 lbs. 
It would appear from this that nitrate of soda had this season 
been more beneficial to the wheat than ammonia-salts, though, 
as in previous seasons, the use of superphosphate in conjunction 
with them showed marked improvement over the results obtained 
by either salt alone. 
Passing next to the half plots 8 A and 8b, on which the treat- 
ment adopted in 1882 was reversed, the addition of 400 lbs. of 
ammonia-salts, with minerals, to plot 8a, previously manured 
last year with minerals alone, produced an increase of nearly 
2000 lbs, of corn per acre, while the effect of leaving them off, 
and using minerals alone on plot 8iJ, was also very marked, the 
produce falling from 2568 lbs. to 996 lbs. per acre. Similar 
results were shown with nitrate of soda used at the rate of 550 
lbs. per acre. Its application with minerals to plot 9a, manured 
last year with minerals alone, increased the produce by 1846 
lbs., while its omission on plot 9b, where minerals and nitrate 
had been used in 1882, lowered the produce in the single year 
by 1000 lbs. per acre. The larger quantity of nitrate of soda 
does not appear to have shown its superiority over the ammonia- 
salts in the same way as in the case of the smaller quantities. 
In the cases in which ammonia-salts and nitrate of soda were 
omitted, the produce fell in a single year to the average of the 
unmanured plots, showing that the effect of these nitrogenous 
top-dressings is confined to the year of their application. On 
the plots to which farmyard-manure was applied, either con- 
tinuously every year or previously to 1882, there was an increase 
in each case, this being the more marked in the continuously 
manured plots, of which 11b, manured with the larger quantity 
of dung, qpntinued to give the higher produce. These results 
