Report on the Field and Feeding Experiments at JVohurn. 347 
equal halves of one-eighth of an acre each : on one half of 
plot 8 (plot 8a) the usual quantity of mixed minerals alone was 
employed, and on the second half the same quantity of mixed 
minerals, with the addition of 400 lbs. of ammonia-salts, were 
used. 
On plot 9a mixed minerals alone, and on plot 9b minerals, 
with the addition of 550 lbs. of nitrate of soda per acre, were 
applied. In 1883 the treatment, as regards manures, adopted 
in 1882 was reyersed, and plot 8a was dressed with minerals 
and ammonia-salts, and plot 8b with minerals onlv. Similarly 
plot 9a was dressed with minerals and nitrate of soda, and 
plot 9b with minerals only. 
The results of the experiments with the manures on 
plots 8a and 8b, and 9a and 9b, in 1883 are highly instructive. 
The plot 8a, dressed in 1882 with minerals alone, gave 
37'7 bushels of dressed barley, and 1 ton 5 cwts. 26 lbs. of 
straw : and last season, dressed with minerals and the addition 
of ammonia-salts, it yielded 62^ bushels and 1 ton 12 cwts. 1 qr. 
8 lbs. of straw ; whilst plot 8b in 1882, dressed with mine- 
rals and ammonia, and yielding 52' 7 bushels of barley, pro- 
duced last season, when dressed with minerals alone, only 
35"2 bushels and 19 cwts. 3 qrs. of straw. A similarly large 
increase was obtained in 1883 on plot 9a by the addition of 
nitrate of soda to minerals. This plot, it will be seen, yielded 
nearly 61 bushels of corn, and 2 tons 9 cwts. 5 qrs. 12 lbs. 
of straw : whilst in the preceding year, when manured with 
minerals alone, the same plot produced only 37 bushels of 
corn, and 19 cwts. 20 lbs. of straw. 
On the other hand, plot 9b, dressed in 1883 with minerals 
alone, gave onlj- 35'9 bushels of corn, and 1 ton 2 cwts. 16 lbs. 
of straw ; whereas thp same pint in the preceding year, when 
dressed with minerals and nitrate of soda, yielded 66'8 bushels 
of barley, and 2 tons 8 cwts. 3 qrs. 14 lbs. of straw. 
Previous to 1882 the barley on plot 10 was grown for five years 
in succession with well-rotten dung, calculated to contain 100 lbs. 
of ammonia, and on plot 11 with dung calculated to contain 
200 lbs. of ammonia. With a view of studying the lasting 
effects of farmvard-manure, and the probable increased fertility 
of land annually manured with good dung, plots 10 and 11 
were divided in 1882 into two equal halves. From one half 
of these plots the dung was withheld for the first time in 1882, 
and again last season : whilst on the second halves the supply 
of the usual annual quantity of well-rotten dung was con- 
tinued. It appears that, although no dung had been applied 
on plots 10a and 11a for the last two years, the influence of 
the residue of the five previous dungings was clearly per- 
ceptible in« the yield of the barley on those two plots, to a 
