300 
Report oil the Field ExperlmeiLts at Wohnni. 
the same ammonia, and the same used in coujunctiou witli 
minerals gave an increase of G-4< bushels of corn and 7 cwts. of 
straw in favour of nitrate of soda. When, however, double the 
amount of ammonia was given in the two forms along with the 
same minerals, the difierences whether in grain or straw were 
not appreciable. A striking point is brought out by the 
omission for a single year of the nitrogenous top-dressings 
(plots 8a and 9a), for while the produce of plot 9a (nitrate of 
soda) has at once gone down to that of the unmanured plot 1, 
the ammonia-salts applied last in 1887 have still continued to 
give an increase of 6 bushels of corn and G cwts. of straw. Last 
year also there was just about this same difference to note, 
and it has an important baaring on the question of residual 
nitrogen in the soil from previous manurings with these salts. 
In regard to the dung plots, 10a has gone down to the un- 
manured yield, and the 4 tons per acre applied last in 1887 
have only given 4 bushels of increase. The application of 8 
tons per acre has, however, yielded 11 bushels more corn and 
9 cwts. more straw. 
Experiments on the Continuous Growth of Barley. 
The farmyard manure for plot 11b was made in the same 
way as that described in the case of the similar plot of the 
continuous wheat experiment. As previously noted, it was in- 
tended for application only to plot 11b, both 10a and 10b being 
left unmanured, in preparation for rape-cake to be substituted 
in 1889. It must be recorded, however, that the dung was in 
error applied to plot 11a instead of 11b, during the absence 
(through serious illness) of the able and most careful manager. 
Mr. Fraser. 
The dung was ploughed in on March 31, and the barley — 
9 pecks per acre — and mineral manures were sown on April 4. 
The top-dressings of nitrate of soda and ammonia salts followed 
on May 8. Towards harvest puparia of Hessian fly were found 
on the plots, but, as in the case of the wheat, the damage was 
very slight indeed. The wet weather and absence of sunshine 
delayed harvest till very late, but the crop was finally got up on 
September 12, and the produce was thrashed and weighed on 
November 21. 
The results are given in Table II. opposite. 
The barley crop did not suffer to nearly the same extent as 
the wheat, and the general yield of the plots in corn is about 
the same, or slightly above the mean of the ten years 1877-1886. 
The straw is, however, less in quantity. Mineral manures alone 
have given about 2h bushels of corr^ increase. Ammonia salts 
