Report on the Field and Feeding Experiments at Wohirn. 309 
The results obtained in 1881 on the field upon which barley 
has been grown in succession for 5 years, on the whole, are 
confirmed by those obtained previously. 
On most of the plots the barley did not weigh quite so much 
per bushel as in the preceding year, but the yield in corn and 
straw was greater. One of the unmanured plots (No. 7) pro- 
duced a little less corn than the second unmanured plot (No. 1), 
which produced 34 bushels of somewhat light barley, and 16 
cwts. and 11 lbs. of straw per acre. 
The mineral manures on plot 4 had no effect whatever on the 
barley-crop in 1881. This plot, it will be seen, yielded almost 
exactly the same weight of corn and straw as the unmanured plot 
No. 7. 
It will further be seen from the tabulated results that nitrate 
of soda alone applied as a top-dressing in spring at the rate of 
'2\ cwts. per acre gave an increase of about 16 bushels of corn, 
nearly 10 cwts. of straw, over the produce of the unmanured 
plot, No. 7. 
Ammonia-salts alone also gave a considerable increase ; but 
although on plot 2 the same amount of nitrogen was used in the 
shape of ammonia-salts, which on plot 3 was put on the land 
in the form of nitrate of soda, the ammonia-salts on plot 2 
produced 5 bushels less corn and 3 cwts. 1 qr. less straw than 
the nitrate of soda on plot 3. Similar results were obtained in 
the preceding year, when nitrate of soda on plot 2 gave 5 bushels 
more corn and 5 cwts. 1 qr. more straw than the ammonia-salts 
on plot 2. 
The addition of superphosphate of lime and other minerals 
to nitrate of soda or ammonia-salts had a most beneficial effect, 
as may be seen by comparing the produce of plots 5, 6, 8, and 9. 
In this combination nitrate of soda has had a much better effect 
than ammonia-salts. 
Comparing the produce of plot 6, manured with minerals and 
top-dressed in spring with 2i cwts. of nitrate of soda, containing 
as much nitrogen as 200 lbs. of ammonia-salts, with that of 
plot 8, manured with the same amount of minerals and 400 lbs. of 
ammonia-salts, containing twice as much nitrogen as the nitrate 
of soda used on plot 6, it will be seen that the smaller propor- 
tion of nitrogen applied in the form of nitrate gave fully as 
much corn and rather more straw than the larger dose of 
nitrogen applied to the land in the shape of salts of ammonia. 
On plot 9, top-dressed with twice as much nitrate of soda as 
plot 6, a further increase both in corn and straw was obtained, 
but this increase was not commensurate with the additional 
application of 2^ cwts. of nitrate of soda. 
