for Twenty Years in succession on the same Land. .')()3 
The twenty-second crop of barley in succession is now growing, 
in a field immediately adjoining that devoted to the experiments 
on wheat, and having a soil and subsoil of, similar general cha- 
racters, namely, " a somewhat heavy loam, with a subsoil of raw 
yellowish-red clay, but resting in its turn upon chalk, which pro- 
vides good natural drainage." It is obvious that, in wet seasons, 
such a soil is not well suited for the growth of the crop after 
roots fed on the land by sheep, as is the custom of the locality ; 
but the results which have been recorded abundantly prove that, 
when grown under favourable conditions, large crops of barley, 
of good quality, may be obtained from such land. 
Without manure, the average produce of barley, over twenty 
years, was 21 bushels of dressed corn, of 52^ lbs. per bushel, and 
12 cwts. of straw. The quantity fell off considerably, but the 
quality was considerably higher over the second than over the 
first ten years. Compared with wheat without manure, barley 
gave more corn, less straw, but nearly the same quantity of 
total produce ; it, however, fell otF more in produce of grain, and 
about equally in straw, over the later years. 
Bij Farmyard manure, the average annual produce was more 
than 48 bushels of dressed corn, of 54t lbs. per bushel, and 
28 cwts. of straw. The quantity of both grain and straw, and 
the quality of the grain, were considerably higher over the second 
than over the first ten years. As without manure, so with farm- 
yard manure, barley, compared with wheat, yielded more corn, 
less straw, but much about the same quantity of total produce. 
Mineral manures alone gave very poor crops ; and the quan- 
tity of both corn and straw fell off considerably during the later 
years. With barley there was much more grain, rather less 
straw, but considerably more total produce than with wheat. 
Nitrogenous manures alone gave much more barley than mineral 
manures alone ; the produce declined much less in the later 
years ; and, for twenty years in succession, fair, though not full, 
crops were obtained. 
Nitrogenous and mineral manures together gave, for twenty years 
in succession on the same land, rather more of both corn and straw 
than farmyard manure, considerably more than the average barley 
crop of the country under rotation, and an average weight per 
bushel of between 53 and 54 lbs. With the same amount of 
nitrogen, and the same mineral manure, applied for twenty 
years, in the autumn for wheat, and in the spring for barley, the 
barley gave much more corn, more straw, and nearly one-third 
more total produce than the wheat. 
Thus, then, with barley as with wheat, mineral manures 
alone failed to enable the plant to obtain sufficient nitrogen and 
carbon to yield even a fair crop. The greater effect of nitro- 
genous manures alone showed that the soil, in its practically 
