for Twenty Years in succession on the same Land. 
91 
Still less will it be necessary to discuss tlie results obtained witli 
barley very prominently in their relation to the points that were 
in controversy in the early years of the progress of the ex- 
periments. 
The experiments on barley were re-commenced in 1(S52, and 
the twentieth crop in succession was harvested in 1871. The land 
selected was a portion of that immediately adjoining the experi- 
mental wheat field, on which the preliminary trials in 1845 had 
been made. About 4 J of the 10 acres were devoted to the pur- 
pose. The general character of the land is much the same as 
that of the wheat field, namely, '•' a somewhat heavy loam, with a 
subsoil of raw, yellowish red clay, but resting in its turn upon 
chalk, which provides good natural drainage." The wheat field 
has, however, as a matter of experiment, been artificially drained, 
but the barley field has not. 
The custom of the locality, in the case of land of similar quality, 
is to take the barley crop after roots fed off by sheep. But it will 
be readily understood from the above description of the soil, that 
it is too heavy for this to be done with advantage in wet seasons. 
Nevertheless, good crops, both in point of quantity and quality, 
are so grown, on such land, in favourable seasons, and may, as a 
rule, be relied upon when barley is taken, not after folding, but 
after another corn crop. 
The questions to be solved by the experiments on barley may 
be stated in the same terms as were employed in introducing the 
Report of the results obtained with wheat : — " What are the grain- 
yielding capabilities of such land ? — what its powers of endur- 
ance ? — in what constituents, or class of constituents, does it 
soonest show signs of exhaustion ? — and hoAV far Avill the answers 
arrived at on these points in reference to it, accord with, or be a 
guide to, those which would apply to any large proportion of the 
arable land of Great Britain when farmed in the ordinary way, 
with rotation ? " 
The Field ExPEniMENTS on Baeley. 
The previous cropping of the land set apart in 1852 for the 
continuous growth of barley was as under : — 
1847, Swedish turnips, with farmyard manure and super- 
phosphate (the roots carted off). 
1848, Barley. 
1849, Clover. 
1850, Wheat. 
1851, Barley, with sulphate of ammonia. 
It had thus already grown two corn crops in succession, and 
was, therefore, agriculturally speaking, in a somewhat exhausted 
