Report on the Field and Feeding Experiments at Wohnrn. 337 
On the whole, the experiments on the continuous growth of 
barley were quite as successful in 1878 as in the preceding year, 
and most of the results obtained in one year accord well with 
those of the other. 
Thus, it will be seen that 200 lbs. of ammonia-salts alone 
applied on plot 2 produced 6 bushels more barley than 275 lbs. 
of nitrate of soda, containing the same amount of nitrogen. 
In conformity with last year's experience, neither mineral- 
manures alone, nor farmyard-manure containing nitrogen equal 
to 100 lbs. of ammonia, had any effect on the barley ; and double 
the quantity of dung on plot 11 only raised the produce in corn 
about 6 bushels over that of the unmanured plot No. 1. As 
last year, the heaviest crop in 1878 was produced on plot 8, 
manured with minerals and 400 lbs. of ammonia-salts. The pro- 
duce on plot 8, it will be seen, amounted to nearly 50 bushels. 
Last year the same plot yielded 52-5- bushels. 
Nitrate of soda, containing as much nitrogen as 400 lbs. of 
ammonia-salts, applied in conjunction with minerals on plot 9, 
produced about 5 bushels less barley than plot 8. 
On the other hand, plot 6, manured with minerals and ni- 
trate of soda containing as much nitrogen as the 200 lbs. of 
ammonia-salts, applied in conjunction with minerals to plot 5, 
produced more barley than plot 5. 
It is singular that the produce in corn and straw of one of the 
unmanured plots (No. 7) was nearly the same in 1878 as it 
was in 1877. 
Thus, last year No. 7 produced 19^ bushels of barley and 
12 cwts. of straw, and in 1878 the same plot yielded 19-j\ bushels 
of corn and 12 cwts. 1 qr. 4 lbs. of straw. 
Last year there was a considerable difference in the weight of 
produce of the unmanured plots, and a similar difference will be 
noticed again in the produce of the two unmanured plots 1 and 7. 
Last year, plot 1 yielded 22^^ bushels of corn and 13^ cwts. of 
straw, and this year 24 bushels of corn and 16 cwts. IG lbs. 
of straw. 
It is well to bear in mind that similar differences in the pro- 
ductiveness of two parts of the same field treated precisely alike 
have a real existence, and that for this reason no undue infer- 
ences must be drawn from comparatively small differences 
in the results of field experiments with various fertilising 
materials. 
The Experiments on Rotation. 
The Woburn Rotation Experiments comprise 16 acres, di- 
vided into four sections, one for each rotation. 
VOL. XV. — S. S. Z 
